Geologic units in Georgia (state in United States)

Mineral Resources On-Line Spatial Data

Charlton Formation and Duplin Marl (Pliocene) at surface, covers < 0.1 % of this area

Charlton Formation and Duplin Marl

Lithology: limestone; clay or mud

Eocene undifferentiated (Eocene) at surface, covers 0.7 % of this area

Eocene undifferentiated, highly weathered sands and sandy clays of lower Tertiary age

Lithology: sand; clay or mud

Neogene undifferentiated (Neogene) at surface, covers 16 % of this area

Neogene undifferentiated, includes Altamaha Grit (Dall, 1892); Citronelle Formation (Matson & Berry, 1916); and "Hawthorn Formation" (Cooke, 1939). (*) - outcrops of indurated sandstone and claystone

Lithology: sandstone; claystone

Knox Group undifferentiated (Ordovician-Cambrian) at surface, covers 2 % of this area

Knox Group undifferentiated

Lithology: dolostone (dolomite); limestone

Mica Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers 2 % of this area

Mica Schist/ Gneiss

Lithology: mica schist; gneiss

Chickamauga Group undivided (Ordovician) at surface, covers 0.2 % of this area

Chickamauga Group undivided

Lithology: limestone

Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 4 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Lithology: biotite gneiss; mica schist; amphibolite

Mylonitic rocks of Brevard fault zone (Late Paleozoic) at surface, covers < 0.1 % of this area

Mylonitic and phyllonitic equivalents of Chauga River Formation and other adjacent rock units

Lithology: mylonite; phyllonite

Conasauga Group; Maynardville Limestone (Cambrian) at surface, covers < 0.1 % of this area

Conasauga Group; Maynardville Limestone

Lithology: limestone

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 1 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Lithology: biotite gneiss; felsic gneiss

Princess Anne shoreline complex - barrier island facies (Pleistocene) at surface, covers 0.2 % of this area

Princess Anne shoreline complex - barrier island facies

Lithology: beach sand

Biotite Gneiss/ Amphibolite (Age not given) at surface, covers 0.4 % of this area

Biotite Gneiss/ Amphibolite

Lithology: biotite gneiss; amphibolite

Granitic Gneiss undifferentiated (Precambrian-Paleozoic) at surface, covers 3 % of this area

Granitic Gneiss undifferentiated

Lithology: granitic gneiss

Stream alluvium (Quaternary) at surface, covers 3 % of this area

Stream alluvium and undifferentiated terrace deposits

Lithology: alluvium; alluvial terrace

Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 2 % of this area

Mica Schist/ Gneiss/ Amphibolite

Lithology: mica schist; gneiss; amphibolite

Pamlico shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 2 % of this area

Pamlico shoreline complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Ocoee Supergroup, Great Smokey Group; Copperhill Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Copperhill Formation - metagraywacke, massive, graded bedding common; includes dark-gray slate, mica schist, and nodular calc-silicate rock.

Lithology: metasedimentary rock; slate; mica schist; calc-silicate rock

Amphibolite (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Amphibolite

Lithology: amphibolite

Sillimanite Schist (Precambrian-Paleozoic) at surface, covers 0.5 % of this area

Sillimanite Schist

Lithology: schist

Quartzite (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Quartzite

Lithology: quartzite

Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Hornblende Gneiss

Lithology: gneiss

Ocoee Supergroup, Great Smokey Group; Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist (Late Proterozoic) at surface, covers < 0.1 % of this area

Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist - beds and lenses of calc-silicate rock locally abundant; garnet, staurolite, and cross-biotite porphyroblasts common in fine-grained layers. Includes Hughes Gap and Hothouse formations in southern area; Horse Branch Member of Ammons Formation and Grassy Branch Formation in northern area.

Lithology: metasedimentary rock; mica schist; calc-silicate rock

Undifferentiated pelitic rocks (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Undifferentiated pelitic rocks, includes mica schists, metasiltstones, metaconglomerates, and metagraywackes

Lithology: mica schist; metasedimentary rock; meta-conglomerate

Tuscaloosa Formation (Cretaceous) at surface, covers 0.5 % of this area

Tuscaloosa Formation

Lithology: sand; clay or mud; gravel

Providence Sand (Cretaceous) at surface, covers 1.0 % of this area

Providence Sand, includes Perote Member

Lithology: sand

Meta-argillite/ Phyllite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Meta-argillite/ Phyllite

Lithology: metasedimentary rock; phyllite

Chilhowee Formation (Cambrian) at surface, covers < 0.1 % of this area

Chilhowee Formation, includes Weisner Formation of Kesler, 1950

Lithology: sandstone; shale; conglomerate

Shady Dolomite (Cambrian) at surface, covers < 0.1 % of this area

Shady Dolomite

Lithology: dolostone (dolomite)

Jacksons Gap Group; Jacksons Gap Group undifferentiated in part (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Jacksons Gap Group undivided - principally graphitic sericite (muscovite)-quartz schist; includes sericite-quartz phyllonite; sericite phyllonite, blastomylonite, porphyroclastic blastomylonite schist, and mylonite quartzite occur principally along margins in south and form most of unit northeast of Jacksons Gap, Tallapoosa County.

Lithology: schist; phyllonite; mylonite; quartzite

Granite Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 2 % of this area

Granite Gneiss/ Amphibolite

Lithology: granitic gneiss; amphibolite

Amphibolitic Schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolitic Schist

Lithology: amphibole schist

Hornblende Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 2 % of this area

Hornblende Gneiss/ Amphibolite

Lithology: gneiss; amphibolite

Rome Formation (Cambrian) at surface, covers 0.3 % of this area

Rome Formation

Lithology: sandstone; shale

Quartz Sericite Schist/ Biotitic Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartz Sericite Schist/ Biotitic Gneiss

Lithology: schist; biotite gneiss

Twiggs Clay (Eocene) at surface, covers 2 % of this area

Twiggs Clay

Lithology: clay or mud

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated (Paleocene) at surface, covers 0.3 % of this area

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated

Lithology: clay or mud; sand

Chickamauga Group; Upper and Middle Ordovician rocks (Oum) includes Sequatchie Limestone, Murfreesboro Limestone, Ridley Limestone, Moccasin Limestone and Bays Formation. (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Upper and Middle Ordovician rocks (Oum) includes Sequatchie Limestone, Murfreesboro Limestone, Ridley Limestone, Moccasin Limestone and Bays Formation.

Lithology: limestone

Wedowee Group; Wedowee Group undifferentiated (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Wedowee Group undifferentiated - Wedowee Group undifferentiated includes the Cragford Phyllite and Cutnose Gneiss. Cragford Phyllite -- interbedded fine-grained graphite-chlorite-sericite schist and phyllite, garnet-sericite schist and phyllite, graphite-quartz-sericite phyllite, locally feldspathic biotite gneiss, calc-silicate rock, and quartzite. Cutnose Gneiss -- cyclically interbedded fine-grained quartz-biotite feldspathic gneiss, graphite-chlorite-sericite schist, locally thin interbeds of graphite-quartz-sericite phyllite, and quartzite. Rocks in the area northeast of Clanton in Chilton and Coosa Counties that are here assigned to the Wedowee Group also have been interpreted as part of the Higgins Ferry Group.

Lithology: schist; phyllite; felsic gneiss; quartzite; calc-silicate rock

Mica Schist (Precambrian-Paleozoic) at surface, covers 0.7 % of this area

Mica Schist

Lithology: mica schist

Epidote Quartzite/ Amphibolite/ Sericite Schist/ Biotite Granite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Epidote Quartzite/ Amphibolite/ Sericite Schist/ Biotite Granite Gneiss

Lithology: quartzite; amphibolite; schist; granite gneiss

Conasauga Group, including Maynardville Limestone, Nolichucky Shale, the Maryville, Rogersville, and Rutledge Formations, Pumpkin Valley Shale, Rome Formation, and Shady Dolomite (Cambrian) at surface, covers < 0.1 % of this area

Conasauga Group - Mostly shale northwest of a line connecting Etowah and Bearden (Knoxville); to the east it consists of the six formations at right [Cmn, Maynardville Limestone. Ccl including Cn, Nolichucky Shale, Cmr Maryville, Rogersville, and Rutledge Formations, and Pumpkin Valley Shale; Cr, Rome Formation, and Cs, Shady Dolomite. Thickness about 2,000 feet.

Lithology: shale; limestone; dolostone (dolomite); sandstone; siltstone

Pleistocene-Pliocene sands and gravels (Pleistocene-Pliocene) at surface, covers 6 % of this area

Pleistocene-Pliocene sands and gravels, includes, in part, Sunderland, Coharie, and Brandywine "Formations" of Cooke, 1939

Lithology: sand; gravel

Penholoway shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 0.9 % of this area

Penholoway shoreline complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Granite undifferentiated (Precambrian-Paleozoic) at surface, covers 1 % of this area

Granite undifferentiated

Lithology: granite

Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Ultramafic rocks undifferentiated

Lithology: ultramafic intrusive rock

Miccosukee Formation (Neogene) at surface, covers 4 % of this area

Miccosukee Formation

Lithology: clay or mud; sand; gravel

Selma Group; Cusseta Sand Member of the Ripley Formation (Cretaceous) at surface, covers < 0.1 % of this area

Cusseta Sand Member of the Ripley Formation - (Selma Group), Cross-bedded, medium to coarse sand; glauconitic, fossiliferous fine sand; and dark-gray fossiliferous, micaceous, carbonaceous clay. The member occurs at the base of the Ripley Formation and extends from Georgia westward into Montgomery County where it merges with the Demopolis Chalk.

Lithology: sand; clay or mud

Devonian-Missisippian undivided (Devonian-Mississippian) at surface, covers 0.1 % of this area

Devonian-Missisippian undivided (DMu): Includes Fort Payne Chert, Chattanooga Shale in Dade Co.; Fort Payne Chert at top, Chattanooga Shale in middle and Armuchee Shale at bottom in all areas except Polk Co. and Dade Co.; Fort Payne Chert, and Armuchee Chert in Polk Co. CHATTANOOGA Shale (Dc)

Lithology: shale ; chert

Tuscahoma Sand (Paleocene) at surface, covers 0.3 % of this area

Tuscahoma Sand, as mapped includes lower Eocene Bashi Marl Member of the Hatchetigbee Formation

Lithology: sand

Brasstown Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Brasstown Formation - cross-biotite schist; includes micaceous quartzite in lower part.

Lithology: mica schist; quartzite

Biotitic Gneiss Undifferentiated (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Biotitic Gneiss Undifferentiated

Lithology: biotite gneiss

Talbot shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 0.4 % of this area

Talbot shoreline complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Granite/ gneissic biotite granite (Precambrian-Paleozoic) at surface, covers 0.6 % of this area

Granite/ gneissic biotite granite

Lithology: granite

Armuchee Chert (Devonian) at surface, covers < 0.1 % of this area

Armuchee Chert

Lithology: chert

Mica Schist/ Quartzite/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.1 % of this area

Mica Schist/ Quartzite/ Gneiss/ Amphibolite

Lithology: mica schist; quartzite; gneiss; amphibolite

High terrace deposits (Pleistocene) at surface, covers < 0.1 % of this area

High terrace deposits - Varicolored lenticular beds of poorly sorted sand, ferruginous sand, silt, clay, and gravelly sand. Sand consists primarily of very fine to very coarse poorly sorted quartz grains; gravel composed of quartz, quartzite, and chert pebbles.

Lithology: terrace

Meta-argillite/ Sericite phyllite/ Metavolcanics (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Meta-argillite/ Sericite phyllite/ Metavolcanics

Lithology: metasedimentary rock; phyllite; metavolcanic rock

Wicomico Shoreline Complex - marsh and lagoonal facies (Pleistocene) at surface, covers 3 % of this area

Wicomico Shoreline Complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Floyd Shale; Hartselle Sandstone member (Mississippian) at surface, covers 1 % of this area

Hartselle Sandstone member (Mh) in Floyd County

Lithology: sandstone

Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.1 % of this area

Mica Schist/ Amphibolite

Lithology: mica schist; amphibolite

Sericite Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Sericite Schist/ Amphibolite

Lithology: schist; amphibolite

Newman Limestone (Mississippian) at surface, covers < 0.1 % of this area

Newman Limestone - Gray limestone sequence near Cumberland Plateau and on Whiteoak Mountain. Shaly limestone, shale, siltstone, and sandstone on Chilhowee Mountain. Thickness about 700 feet.

Lithology: limestone; shale; siltstone; sandstone

Talbot shoreline complex - barrier island facies (Pleistocene) at surface, covers 0.2 % of this area

Talbot shoreline complex - barrier island facies

Lithology: beach sand

Lower Tertiary-Cretaceous undifferentiated (Lower Tertiary-Cretaceous) at surface, covers 1 % of this area

Lower Tertiary-Cretaceous undifferentiated, as mapped includes Middendorf Formation (Sloan, 1904); "Channel Sands" (LaMoreaux, 1946); Tuscaloosa Formation (Cooke, 1939); and "Huber beds" (Buie, informal terminology)

Lithology: sand; clay or mud

Quartzite/ Mica Schist (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Quartzite/ Mica Schist

Lithology: quartzite; mica schist

Quartz Mica Schist/ Hornblende Schist/ Biotitic Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartz Mica Schist/ Hornblende Schist/ Biotitic Gneiss

Lithology: mica schist; amphibole schist; biotite gneiss

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist (Precambrian-Paleozoic) at surface, covers 0.5 % of this area

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist

Lithology: metavolcanic rock; phyllite; schist

St. Louis Limestone and Warsaw Limestone (Mississippian) at surface, covers < 0.1 % of this area

St. Louis Limestone - Residuum of nodules and blocks of chert in sandy clay. (Originally grayish-brown, medium-bedded limestone.) Maximum preserved thickness about 50 feet. Warsaw Limestone - Residuum of porous chert blocks in sandy clay. (Originally gray, medium- to coarse-grained, thick- bedded limestone.) Thickness about 60 feet.

Lithology: clay or mud; chert

Conasauga Group; Middle unit; Shale unit (Cambrian) at surface, covers 0.2 % of this area

Conasauga Group; Middle unit; Shale unit: Includes limestone unit (Ccls), possible equivalent of Rutledge Limestone of Tennessee and shale unit (Cc), possible equivalent of Rogersville Shale of Tennessee

Lithology: shale; limestone

Blufftown Formation (Cretaceous) at surface, covers 0.4 % of this area

Blufftown Formation

Lithology: clay or mud; sand

Nolichucky Shale, and Maryville, Rogersville, and Rutledge Formations, and Pumpkin Valley Shale (Cambrian) at surface, covers < 0.1 % of this area

(Cn) Nolichucky Shale - Pastel-colored (pink, greenish, olive), flaky clay shale; gray, commonly oolitic, shaly limestone lenses; locally stromatolitic limestone layers; thin, blocky siltstone near middle. Thickness 500 feet in the east to 900 feet in the west.; (Cmr) Maryville, Rogersville, and Rutledge Formations - Maryvile and Rutledge are gray limestone, in part oolitic, with gray dolomite locally. Rogersville is green clay shale. Thickness 400 to 1,000 feet. Pumpkin Valley Shale - Dull-brown to maroon shale with numerous interbeds of thin, blocky, sandy siltstone. Thickness 100 to 600 feet.

Lithology: shale; limestone; dolostone (dolomite); siltstone

Pamlico shoreline complex - barrier island facies (Pleistocene) at surface, covers 0.2 % of this area

Pamlico shoreline complex - barrier island facies

Lithology: beach sand

Sillimanite Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Sillimanite Schist/ Gneiss

Lithology: schist; gneiss

Mylonite and ultramylonite (Age not given) at surface, covers 0.1 % of this area

Mylonite and ultramylonite

Lithology: mylonite

Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 3 % of this area

Biotite gneiss

Lithology: biotite gneiss

Calcareous mica schist/ Micaceous marble/ Mica schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Calcareous mica schist/ Micaceous marble/ Mica schist

Lithology: mica schist; marble

Alluvial, coastal and low terrace deposits (Holocene) at surface, covers < 0.1 % of this area

Alluvial, coastal and low terrace deposits - Varicolored fine to coarse quartz sand containing clay lenses and gravel in places. Gravel composed of quartz and chert pebbles and assorted metmorphic and igneous rock fragments in streams near the Piedmont. In areas of the Valley and Ridge province gravel composed of angular to subrounded chert, quartz, and quartzite pebbles. Coastal deposits include fine to medium quartz sand with shell fragments and accessory heavy minerals along Gulf beaches and fine to medium quartz sand, silt, clay, peat, mud and ooze in the Mississippi Sound, Little Lagoon, bays, lakes, streams, and estuaries.

Lithology: beach sand; alluvium

Floyd Shale (Mississippian) at surface, covers 0.3 % of this area

Floyd Shale (Mfs): includes the Hartselle Sandstone Member (Mh) in Floyd County and an unnamed limestone member (Ml in Floyd County) at the base

Lithology: shale

Lookout Sandstone; Gizzard Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Lookout Sandstone; Gizzard Formation

Lithology: shale; sandstone; coal

Cusseta Sand (Cretaceous) at surface, covers 0.5 % of this area

Cusseta Sand

Lithology: sand; clay or mud; siltstone

Dadeville Complex; Rock Mills Granite Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Rock Mills Granite Gneiss - coarse to medium-grained biotite granite gneiss; locally includes thick bands of epidote and thin, small amphibolite bodies. Boundary between Rock Mills Granite Gneiss and Camp Hill Granite Gneiss arbitrarily defined.

Lithology: granitic gneiss; amphibolite

Non-porphyritic granite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Non-porphyritic granite

Lithology: granite

Holston Formation (Ordovician) at surface, covers < 0.1 % of this area

Holston Formation - Pink, gray, and red coarsely crystalline limestone (Holston Marble); in many areas upper part is sandy, crossbedded ferruginous limestone and brown to greenish calcareous shale. Thickness 200 to 600 feet.

Lithology: limestone; shale

Claiborne undifferentiated (Eocene) at surface, covers 0.8 % of this area

Claiborne undifferentiated, up-dip equivalent of Lisbon and Tallahatta Formations

Lithology: sandstone; clay or mud; carbonate

Conasauga Group; Middle unit; Limestone unit (Cambrian) at surface, covers 0.1 % of this area

Conasauga Group; Middle unit; Limestone unit: Includes limestone unit (Ccls), possible equivalent of Rutledge Limestone of Tennessee and shale unit (Cc), possible equivalent of Rogersville Shale of Tennessee

Lithology: limestone

Chickamauga Group; Chota Formation (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Chota Formation

Lithology: limestone; calcarenite

Quartzite/ Biotite Granite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartzite/ Biotite Granite Gneiss

Lithology: quartzite; granitic gneiss

Hawthorn Group, Torreya Formation (Miocene) at surface, covers < 0.1 % of this area

Hawthorn Group, Torreya Formation - Torreya Formation - The Torreya Formation is exposed or near the surface from western Gadsden County eastward to western-most Hamilton County. It is informally subdivided into a lower carbonate unit and an upper siliciclastic unit (Scott, 1988). The majority of Torreya Formation outcrops expose the siliciclastic part of the unit. The carbonate sediments are white to light olive gray, generally poorly indurated, variably sandy and clayey, fossiliferous (molds and casts) limestone (mudstone and wackestone). The limestones often grade into calcareous-cemented sands. Phosphate is present in the carbonate sediments, particularly in the Sopchoppy Member. The siliciclastics vary from white to light olive gray, unconsolidated to poorly indurated, slightly clayey sands with minor phosphate to light gray to bluish gray, poorly consolidated, variably silty clay (Dogtown Member). The siliciclastics are sporadically fossiliferous. The Torreya Formation overlies the FAS and forms part of the intermediate confining unit/aquifer system.

Lithology: limestone; sandstone; clay or mud; silt

Eutaw Formation (Cretaceous) at surface, covers 0.2 % of this area

Eutaw Formation

Lithology: clay or mud; sand

Metagraywacke/ Mica Schist (Precambrian-Paleozoic) at surface, covers 0.9 % of this area

Metagraywacke/ Mica Schist

Lithology: metasedimentary rock; mica schist

Ripley Formation (Cretaceous) at surface, covers 0.8 % of this area

Ripley Formation

Lithology: clay or mud; sand; limestone

Parkwood and Pennington Formations undifferentiated (Pennsylvanian-Mississippian) at surface, covers < 0.1 % of this area

Parkwood and Pennington Formations undifferentiated - Interbedded medium to dark-gray shale and light to medium-gray sandstone, locally contains lithic conglomerate, dusky-red and grayish-green mudstone, argillaceous limestone, and clayey coal.

Lithology: shale; sandstone; conglomerate; mudstone; limestone; clay or mud; mixed clastic/coal

Irwinton Sand (Eocene) at surface, covers 2 % of this area

Irwinton Sand (Ei), up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.

Lithology: sand

Suwannee Limestone and its residuum (Oligocene) at surface, covers 2 % of this area

Suwannee Limestone and its residuum, as mapped, includes Chattahoochee Limestone in Seminole and Decatur Cos.; Flint River Formation, in part, (Cooke, 1939); Jacksonboro Limestone in Screven Co.; and Glendon and Marianna Limestones in Pulaski Co.

Lithology: limestone

Nanafalia Formation (Paleocene) at surface, covers 0.2 % of this area

Nanafalia Formation

Lithology: sand; clay or mud

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 1 % of this area

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss

Lithology: granitic gneiss; biotite gneiss; amphibolite

Granite Gneiss/ Granite (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Granite Gneiss/ Granite

Lithology: granitic gneiss; granite

Biotite-plagioclase-quartz gneiss and biotite-muscovite schist (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Biotite-plagioclase-quartz gneiss and biotite-muscovite schist: variably interlayered, containing subordinate layers of amphibolite and sillimanite-mica schist

Lithology: biotite gneiss; schist; amphibolite

Mineral Bluff Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Mineral Bluff Formation - quartz-chlorite-sericite schist and phyllite with thin quartzite layers and minor interbedded graphitic schist, garnet-mica schist, staurolite schist, cross-biotite schist, and dark slate.

Lithology: schist; phyllite; quartzite; slate

Sillimanite Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Sillimanite Schist/ Amphibolite

Lithology: schist; amphibolite

Tallulah Falls Formation, gneiss and schist (Neoproterozoic) at surface, covers < 0.1 % of this area

Tallulah Falls Formation, gneiss and schist: biotite-quartz-plagioclase gneiss interpreted to be metagraywacke, and interlayered biotite-muscovite schist, garnet-mica schist and amphibolite

Lithology: paragneiss; schist; amphibolite

Dadeville Complex; Ropes Creek Amphibolite (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Ropes Creek Amphibolite - layered and massive amphibolite; locally includes hornblende migmatite and ultramafic pods.

Lithology: amphibolite; migmatite; ultramafic intrusive rock

Porphyritic granite (Precambrian-Paleozoic) at surface, covers 0.5 % of this area

Porphyritic granite

Lithology: granite

Crab Orchard Mountains Group (Pennsylvanian) at surface, covers < 0.1 % of this area

Crab Orchard Mountains Group - Only the lowest formation of the group, the Sewanee Conglomerate, is preserved in the area of this sheet. Sewanee is gray to brown, medium- to coarse-grained conglomeratic sandstone, with a thin zone of ferruginous quartz- and shale-pebble conglomerate at base. Maximum preserved thickness 35 feet.

Lithology: conglomerate; sandstone

Red Mountain Formation (Silurian) at surface, covers < 0.1 % of this area

Red Mountain Formation - Interbedded yellowish-gray to moderate-red sandstone, siltstone and shale; greenish-gray to moderate-red fossiliferous partly silty and sandy limestone; few thin hematitic beds.

Lithology: sandstone; shale; siltstone; limestone

Silver Bluff shoreline complex (Pleistocene) at surface, covers 0.1 % of this area

Silver Bluff shoreline complex

Lithology: beach sand

Selma Group; Ripley Formation (Cretaceous) at surface, covers < 0.1 % of this area

Ripley Formation - (Selma Group), Light-gray to pale-olive massive, micaceous, glauconitic, fossiliferous fine sand; sandy calcareous clay; and thin indurated beds of fossiliferous sandstone.

Lithology: sand; clay or mud; sandstone

Metagraywacke/ Mica Schist-Quartzite/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.7 % of this area

Metagraywacke/ Mica Schist-Quartzite/ Amphibolite

Lithology: metasedimentary rock; mica schist; quartzite; amphibolite

Sillimanite Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.5 % of this area

Sillimanite Schist/ Gneiss/ Amphibolite

Lithology: schist; gneiss; amphibolite

Ocala Limestone (Eocene) at surface, covers 5 % of this area

Ocala Limestone, generally covered with Oligocene and Eocene residuum (Flint River Formation of Cooke, 1939); includes up-dip area, Tivola Limestone of Connell (1955). (*)- outcrops of Ocala Limestone on Dougherty Plain.

Lithology: limestone

Garnet Mica Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Garnet Mica Schist/ Gneiss

Lithology: mica schist; gneiss

Residuum on Oligocene sediments (Oligocene) at surface, covers < 0.1 % of this area

Residuum on Oligocene sediments - The undifferentiated Oligocene residuum, mapped on parts of the Chattahoochee "Anticline", characteristically consists of reddish brown, variably sandy clay with inclusions of variably fossiliferous, silicified limestone (Huddlestun, 1993). The residuum includes Lower and Upper Oligocene weathered sediments (Huddlestun, 1993).

Lithology: limestone; sand; clay or mud

Penholoway shoreline complex - barrier island facies (Pleistocene) at surface, covers 0.5 % of this area

Penholoway shoreline complex - barrier island facies

Lithology: beach sand

Garnet Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Garnet Mica Schist/ Amphibolite

Lithology: mica schist; amphibolite

Holocene Shoreline Complex - marsh and lagoonal facies (Holocene) at surface, covers 1.0 % of this area

Holocene Shoreline Complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Conglomerate (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Conglomerate

Lithology: conglomerate

Flinty Crush Rock (Age not given) at surface, covers < 0.1 % of this area

Flinty Crush Rock

Lithology: mylonite

Burkes Mountain complex, ultramafic rock (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Burkes Mountain complex, ultramafic rock

Lithology: ultramafic intrusive rock

Phyllite undifferentiated (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Phyllite undifferentiated

Lithology: phyllite

Migmatite paragneiss and schist of Kiokee belt (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Migmatite paragneiss and schist of Kiokee belt: migmatitic hornblende-biotite paragneiss having interlayered sillimanite schist and amphibolite

Lithology: paragneiss; schist; amphibolite

Eocene and Oligocene Residuum, undifferentiated (Eocene-Oligocene) at surface, covers 2 % of this area

Eocene and Oligocene Residuum, undifferentiated

Lithology: sand; clay or mud

Little River Sequence, metasedimentary rocks (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Little River Sequence, metasedimentary rocks: white-mica schist and phyllite, metatuff, quartz-muscovite schist, and minor quartzite

Lithology: mica schist; phyllite; metavolcanic rock; schist; quartzite

Wallhalla metamorphic suite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Wallhalla metamorphic suite: predominately hornblende-plagioclase gneiss and amphibolite, locally having interlayers of biotite-quartz-feldspar gneiss, undivided

Lithology: mafic gneiss; amphibolite

Sericite Schist (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Sericite Schist

Lithology: schist

Biotitic Gneiss / Amphibolite (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Biotitic Gneiss / Amphibolite

Lithology: biotite gneiss; amphibolite

Conasauga Group; Upper unit; limestone and shale unit (Cambrian) at surface, covers 0.7 % of this area

Conasauga Group; Upper unit; limestone and shale unit: Includes limestone and shale unit (Ccsl). Possible equivalent of the Maryville Limestone and Nolichucky Shale of Tennessee with a dolostone member (Ccd).

Lithology: shale; limestone

Granite/ granite gneiss (Precambrian-Paleozoic) at surface, covers 0.1 % of this area

Granite/ granite gneiss

Lithology: granite; granitic gneiss

Sequatchie Formation (Ordovician) at surface, covers < 0.1 % of this area

Sequatchie Formation - Grayish-red, grayish-green, and yellowish-gray thin-bedded calcareous shale and calcareous mudstone containing interbedded fossiliferous limestone, and medium-gray to moderate-red partly sandy and glauconitic, medium to coarse-grained bioclastic limestone.

Lithology: shale; mudstone; limestone

Fort Payne Shale; Lavender Shale Member (Mississippian) at surface, covers < 0.1 % of this area

Fort Payne Shale (Mfp) with Lavender Shale Member (Mls)

Lithology: shale

Wicomico Shoreline Complex - barrier island facies (Pleistocene) at surface, covers 0.6 % of this area

Wicomico Shoreline Complex - barrier island facies

Lithology: beach sand

Conasauga Group; Lower unit; shale and sandstone unit (Cambrian) at surface, covers 0.5 % of this area

Conasauga Group; Lower unit; shale and sandstone unit: Includes shale and sandstone unit (Ccs) with lower dolostone unit (Ccdl). Possible equivalent of Pumpkin Valley Shale of Tennessee

Lithology: shale; sandstone

Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss

Lithology: gneiss; granitic gneiss; biotite gneiss

Quartzite/ Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartzite/ Mica Schist/ Amphibolite

Lithology: quartzite; mica schist; amphibolite

Pine Mountain Group; Manchester Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Manchester Schist - interlayered muscovite-quartz schist and quartzite, locally contains garnet, sillimanite and graphite; commonly intensely shared.

Lithology: schist; quartzite

Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones - mylonite and blastomylonite; contains minor ultramylonite, mylonite schist, and mylonite gneiss.

Lithology: mylonite; schist; gneiss

Undifferentiated sediments (Pliocene/Pleistocene) at surface, covers < 0.1 % of this area

Undifferentiated sediments - Undifferentiated Tertiary-Quaternary Sediments - These sediments are siliciclastics that are separated from undifferentiated Quaternary sediments solely on the basis of elevation. Based on the suggestion that the Pleistocene sea levels reached a maximum of approximately 100 feet (30 meters) msl (Colquhoun, 1969), these sediments, which occur above 100 feet (30 meters) msl, are predominantly older than Pleistocene but contain some sediments reworked during the Pleistocene. This unit may include fluvial and aeolian deposits. The undifferentiated Tertiary-Quaternary sediments occur in a band extending from the Georgia-Florida state line in Baker and Columbia Counties southward to Alachua County. These sediments are gray to blue green, unconsolidated to poorly consolidated, fine to coarse grained, clean to clayey, unfossiliferous sands, sandy clays and clays. Organic debris and disseminated organics are present in these sediments. The undifferentiated Tertiary-Quaternary sediments are part of the surficial aquifer system.

Lithology: sand; clay or mud; peat

Mafic to intermediate metavolcanic rocks (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Mafic to intermediate metavolcanic rocks

Lithology: mafic metavolcanic rock; intermediate intrusive rock

Ashe Metamorphic Suite and Tallulah Falls Formation; Muscovite-biotite gneiss (Late Proterozoic) at surface, covers < 0.1 % of this area

Muscovite-biotite gneiss - locally sulfidic; interlayered and gradational with mica schist, minor amphibolite, and hornblende gneiss.

Lithology: gneiss; mica schist; amphibolite

Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated (Ordovician) at surface, covers < 0.1 % of this area

Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation undifferentiated - variegated dusky-red and pale-yellowish-orange shale, calcareous mudstone, dolomite, siltstone, and minor sandstone. Mapped in areas of facies transition with the Chickamauga Limestone (Canoe Creek, Dunaway, and Hensley Mountains).

Lithology: shale; mudstone; dolostone (dolomite); siltstone; sandstone

Motts Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Motts Gneiss - leucocratic quartz-rich quartz diorite pencil gneiss.

Lithology: felsic gneiss

Conasauga Formation (Cambrian) at surface, covers < 0.1 % of this area

Conasauga Formation - Medium-bluish-gray fine-grained, thin-bedded argillaceous limestone and interbedded dark-gray shale in varying proportions.

Lithology: limestone; shale

Newala Limestone (Ordovician) at surface, covers 0.2 % of this area

Newala Limestone

Lithology: limestone

Pennington Formation (Mississippian) at surface, covers < 0.1 % of this area

Pennington Formation - Highly variegated clay shale, distinctive; contains siltstone and locally gray, fine-grained sandstone. Thickness 400 to 700 feet.

Lithology: shale; siltstone; sandstone

Graphitic Phyllite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Graphitic Phyllite

Lithology: phyllite

Rockwood Formation (Silurian) at surface, covers < 0.1 % of this area

Rockwood Formation - Brown to maroon shale, thin gray siltstone and sandstone, and thin lenticular layers of oolitic and fossiliferous red hematite. Thickness 200 to 800 feet.

Lithology: shale; siltstone; sandstone

Copper Ridge Dolomite (Cambrian) at surface, covers < 0.1 % of this area

Copper Ridge Dolomite

Lithology: dolostone (dolomite)

Clinchfield Sand (Eocene) at surface, covers < 0.1 % of this area

Clinchfield Sand

Lithology: sand

Syenite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Syenite

Lithology: syenite

Persimmon Fork Formation (Cambrian to Neoproterozoic) at surface, covers < 0.1 % of this area

Persimmon Fork Formation: predominately metatuff

Lithology: metavolcanic rock

Cooper Marl (Eocene) at surface, covers < 0.1 % of this area

"Cooper Marl" (Ecm). It is now recognized that this unit is not the precise lithologic or biostratigraphic equivalent of type Cooper Marl (Huddlestun, Marsalis & Pickering, 1974).

Lithology: clay or mud

Ocoee Supergroup; Great Smokey Group, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area

Great Smokey Group, undivided - thick metasedimentary sequence of massive to graded beds of metagraywacke and metasiltstone with interbedded graphitic and sulfidic slate and schist.

Lithology: metasedimentary rock; slate; schist

Chickamauga Limestone (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Limestone - Medium to dark-gray thick to thin-bedded partly argillaceous, locally fossiliferous limestone. Restricted to the western part of the Valley and Ridge province and Murphrees Valley and Wills Valley anticlines. Locally includes a thin interval of Attalla Chert Conglomerate Member at base. Attalla Chert Conglomerate - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized matrix; thin beds of gray-green or dusky-red shale common at base.

Lithology: limestone; conglomerate; chert; shale; dolostone (dolomite); quartzite

Gizzard Group including Warren Point Sandstone and Raccoon Mountain Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Gizzard Group - Sandstone, conglomeratic sandstone, siltstone, shale, and minor coal. Thickness 100 to 200 feet. Includes Warren Point Sandstone - Gray to brown sandstone and minor conglomeratic sandstone. Thickness 60 to 160 feet; Raccoon Mountain Formation - Siltstone, sandstone, shale, and minor coal. Thickness 0 to 65 feet.

Lithology: sandstone; shale; siltstone; coal

Gabbro (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Gabbro

Lithology: gabbro

Quartzite/ Metagraywacke (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartzite/ Metagraywacke

Lithology: quartzite; metasedimentary rock

Garnet Mica Schist (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Garnet Mica Schist

Lithology: mica schist

Ocoee Supergroup, Great Smokey Group; Dean Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Dean Formation - sericite schist with cross-biotite, staurolite, and garnet porphyroblasts; interbedded metagraywacke and quartz-pebble metaconglomerate.

Lithology: mica schist; metasedimentary rock

Amphibolitic Schist/ Amphibolite-Metagraywacke/ Mica Schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolitic Schist/ Amphibolite-Metagraywacke/ Mica Schist

Lithology: amphibole schist; amphibolite; metasedimentary rock; mica schist

Holocene Shoreline Complex - barrier island facies (Holocene) at surface, covers < 0.1 % of this area

Holocene Shoreline Complex - barrier island facies

Lithology: beach sand

Granite (Carboniferous to Permian) at surface, covers < 0.1 % of this area

Granite

Lithology: granite

Bangor Limestone and Hartselle Formation (Mississippian) at surface, covers < 0.1 % of this area

Bangor Limestone - Dark brownish-gray limestone, thick-bedded. Thickness 100 to 250 feet; and Hartselle Formation - Thin-bedded, fine-grained sandstone and greenish-gray shale interbedded with coarse limestone. Thickness 0 to 60 feet.

Lithology: limestone; sandstone; shale

Walden Creek Group; Sandsuck Formation (Precambrian) at surface, covers < 0.1 % of this area

Wladen Creek Group; Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet.

Lithology: shale; sandstone; conglomerate

Attalla Chert Conglomerate Member of the Chickamauga Limestone (Ordovician) at surface, covers < 0.1 % of this area

Attalla Chert Conglomerate Member of the Chickamauga Limestone - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix; thin beds of gray-green or dusky-red shale common at base.

Lithology: conglomerate; chert; shale; dolostone (dolomite); quartzite

Dadeville Complex; Mafic and ultramafic rock (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Mafic and ultramafic rock - ultramafic rock including enstatite pyroxenite, layered actinolite-tremolite amphibolite altered locally to serpentine, anthophyllite, and talc; metanorite; metagabbro; hornblendite; garnet-hornblendite, and massive amphibolite.

Lithology: pyroxenite; amphibolite; hornblendite

Opelika Complex; Loachapoka Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Loachapoka Schist - muscovite-quartz schist; locally contains biotite-garnet-muscovite schist, many layers conatin sillimanite (northeast of Mount Jefferson, Lee County); kyanite (west of Mount Jefferson); locally muscovite-rich schist and quartzite common.

Lithology: mica schist; quartzite

Lisbon Formation (Eocene) at surface, covers < 0.1 % of this area

Lisbon Formation

Lithology: sand

Rome Formation (Cambrian) at surface, covers < 0.1 % of this area

Rome Formation - Variegated (red, green, yellow) shale and siltstone with beds of gray, fine-grained sandstone. Maximum exposed thickness 1,500 feet.

Lithology: shale; siltstone; sandstone

Mississippian undifferentiated (Mississippian) at surface, covers 0.1 % of this area

Mississippian undifferentiated: Includes Pennington Shale, Bangor Limestone (except in Floyd County), Hartselle Sandstone, Golconda Formation, Gasper Limestone, Ste. Genevieve Limestone and St. Louis Limestone

Lithology: limestone; shale; sandstone

Knox Group undifferentiated (Ordovician-Cambrian) at surface, covers < 0.1 % of this area

Knox Group undifferentiated - Light-gray to light-brown locally sandy dolomite, dolomitic limestone, and limestone; characterized by abundant light-colored chert.

Lithology: dolostone (dolomite); limestone; chert

Chickamauga Group; Middle Ordovician rocks; Rockmart Slate (Middle Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Middle Ordovician rocks; Rockmart Slate

Lithology: slate

Amphibolite/ Mica Schist/ Biotitic Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Amphibolite/ Mica Schist/ Biotitic Gneiss

Lithology: amphibolite; mica schist; biotite gneiss

Lincolnton Metadacite (Neoproterozoic) at surface, covers < 0.1 % of this area

Lincolnton Metadacite

Lithology: felsic metavolcanic rock

Citronelle Formation (Pliocene) at surface, covers < 0.1 % of this area

Citronelle Formation - The Citronelle Formation is widespread in the Gulf Coastal Plain. The type section for the Citronelle Formation, named by Matson (1916), is near Citronelle, Alabama. The Citronelle Formation grades laterally, through a broad facies transition, into the Miccosukee Formation of the eastern Florida panhandle. Coe (1979) investigated the Citronelle Formation in portions of the western Florida panhandle. The Citronelle Formation is a siliciclastic, deltaic deposit that is lithologically similar to, and time equivalent with, the Cypresshead Formation and, at least in part, the Long Key Formation (Cunningham et al., 1998) of the peninsula. In the western panhandle, some of the sediments mapped as Citronelle Formation may be reworked Citronelle. The lithologies are the same and there are few fossils present to document a possible younger age. The Citronelle Formation consists of gray to orange, often mottled, unconsolidated to poorly consolidated, very fine to very coarse, poorly sorted, clean to clayey sands. It contains significant amounts of clay, silt and gravel which may occur as beds and lenses and may vary considerably over short distances. Limonite nodules and limonite-cemented beds are common. Marine fossils are rare but fossil pollen, plant remains and occasional vertebrates are found. Much of the Citronelle Formation is highly permeable. It forms the Sand and Gravel Aquifer of the surficial aquifer system.

Lithology: delta; sand; clay or mud; silt; gravel

Hornblende Gneiss/ Amphibolite/ Granite Gneiss (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Hornblende Gneiss/ Amphibolite/ Granite Gneiss

Lithology: gneiss; amphibolite; granitic gneiss

Metadacite (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Metadacite

Lithology: metavolcanic rock

McBean Formation (Eocene) at surface, covers < 0.1 % of this area

McBean Formation

Lithology: clay or mud

Felsic Metavolcanics (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Felsic Metavolcanics

Lithology: felsic metavolcanic rock

Red Mountain Formation (Silurian) at surface, covers 0.3 % of this area

Red Mountain Formation

Lithology: sandstone; shale

Monteagle Limestone (Mississippian) at surface, covers < 0.1 % of this area

Monteagle Limestone - Fragmental and oolitic limestone, light-gray; and fine-grained, brownish-gray limestone. Thickness 180 to 350 feet.

Lithology: limestone

Marble (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Marble

Lithology: marble

Phyllite and Quartzite (Precambrian-Paleozoic) at surface, covers 0.6 % of this area

Phyllite and Quartzite

Lithology: phyllite; quartzite

Granite/ biotite granite/ amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Granite/ biotite granite/ amphibolite

Lithology: granite; amphibolite

Sequatchie Formation (Ordovician) at surface, covers < 0.1 % of this area

Sequatchie Formation - Maroon and gray shaly limestone, mottled greenish; with interbeds of calcareous, olive to maroon shale and siltstone. Average thickness about 200 feet.

Lithology: limestone; shale; siltstone

Chenier plain and deltas of Suwannee & Chattahoochie Rivers (Holocene) at surface, covers < 0.1 % of this area

Chenier plain and deltas of Suwannee & Chattahoochie Rivers

Lithology: unconsolidated deposit

Dadeville Complex; Waverly Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Waverly Gneiss - feldspathic biotite-hornblende gneiss with thin layers of amphibolite, calc-silicate rock, garnet quartzite, and muscovite schist; locally rich in manganese.

Lithology: mafic gneiss; amphibolite; quartzite; mica schist; calc-silicate rock

Chickamauga Group, includes Upper part of Chickamauga Group (Reedsville Shale, and Unnamed limestone unit) and Middle and Lower part of Chickamauga Group (Moccasin Formation, Bays Formation, Ottosee Shale, Holston Formation, Lenoir Limestone, Athens Shale, and Sevier Shale) (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group - In the northwest part of the Valley and Ridge a predominantly limestone sequence about 2,000 feet thick. Becomes progressively more clastic and thicker to the southeast, including Upper part of Chickamauga Group (Reedsville Shale- Greenish-gray calcareous shale. Thickness 0 to 400 feet, and Unnamed Limestone Unit - Medium-grained, fossiliferous, gray limestone, shaly in part. Thickness as much as 600 feet ) and.Middle and lower parts of Chickamauga Group (Omlc)

Lithology: limestone; shale; siltstone; sandstone

Bangor Limestone (Mississippian) at surface, covers < 0.1 % of this area

Bangor Limestone

Lithology: limestone

Sericite Schist/ Micaceous Quartzite/ Sericite Phyllite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Sericite Schist/ Micaceous Quartzite/ Sericite Phyllite

Lithology: schist; quartzite; phyllite

Cross-Biotite Schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Cross-Biotite Schist

Lithology: biotite schist

Aluminous Schist (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Aluminous Schist

Lithology: schist

Ashe Metamorphic Suite and Tallulah Falls Formation; Amphibolite (Late Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Lithology: amphibolite; metasedimentary rock

Maynardville Limestone (Cambrian) at surface, covers < 0.1 % of this area

Maynardville Limestone - Thick-bedded, bluish-gray, ribboned (silt and dolomite), nodular limestone; light-gray, fine- grained, laminated to thin-bedded, noncherty dolomite in upper part. Thickness 150 to 400 feet.

Lithology: limestone; dolostone (dolomite)

Gneissic granite of Antreville pluton (Silurian to Ordovician) at surface, covers < 0.1 % of this area

Gneissic granite of Antreville pluton: gneissic biotite granite to granodiorite

Lithology: granitic gneiss

Knox Group, including Newala Formation, Mascot Dolomite, Kingsport Formation, Longview Dolomite, Chepultepec Dolomite, and Copper Ridge Dolomite (Ordovician to Cambrian) at surface, covers < 0.1 % of this area

Knox Group - Siliceous dolomite and magnesian limestone sequence. Thickness 2,500 to 3,000 feet.

Lithology: dolostone (dolomite); limestone

Biotite Gneiss/ Mica Schist (Age not given) at surface, covers < 0.1 % of this area

Biotite Gneiss/ Mica Schist

Lithology: biotite gneiss; mica schist

Coweeta Group; Biotite Gneiss (Middle/Late Proterozoic) at surface, covers < 0.1 % of this area

Biotite Gneiss - migmatitic; interlayered and gradational with biotite-garnet gneiss and amphibolite; locally abundant quartz and alumino-silicates. Stratigraphic position uncertain.

Lithology: biotite gneiss; amphibolite

Fort Payne Formation (Mississippian) at surface, covers < 0.1 % of this area

Fort Payne Formation - Bedded chert, calcareous and dolomitic, somewhat crinoidal; and minor shale. Thin green shale (Maury) at base. Average thickness about 200 feet.

Lithology: chert; shale

Amphibolite/ Epidote Quartzite/ Granite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolite/ Epidote Quartzite/ Granite Gneiss

Lithology: amphibolite; quartzite; granitic gneiss

Floyd Shale (Mississippian) at surface, covers < 0.1 % of this area

Floyd Shale - Dark-gray shale, sideritic in part; thin beds of sandstone, limestone and chert are locally present; beds of partly bioclastic, partly argillaceous limestone are abundant in parts of Calhoun and Cherokee Counties.

Lithology: shale; sandstone; limestone; chert

Miccosukee Formation (Pliocene) at surface, covers < 0.1 % of this area

Miccosukee Formation - The Miccosukee Formation, named by Hendry and Yon (1967), is a siliciclastic unit with a limited distribution in the eastern panhandle. It occurs in the Tallahassee Hills from central Gadsden County to eastern Madison County, often capping hills. The Miccosukee Formation grades to the west, through a broad facies transition, in central Gadsden County into the Citronelle Formation. The Miccosukee Formation is a prodeltaic deposit. The Miccosukee Formation is composed of grayish orange to grayish red, mottled, poorly to moderately consolidated, interbedded clay, sand and gravel of varying coarseness and admixtures (Hendry and Yon, 1967). The unit is relatively impermeable but is considered a part of the surficial aquifer system (Southeastern Geological Society, 1986).

Lithology: clay or mud; sand; gravel

Charnockite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Charnockite

Lithology: charnockite

Pennsylvanian undifferentiated (Pennsylvanian) at surface, covers 0.2 % of this area

Pennsylvanian undifferentiated

Lithology: sandstone; shale; conglomerate

Alluvial Valley Swamp (Quaternary) at surface, covers < 0.1 % of this area

Alluvial Valley Swamp: Unconformable on all underlying units, fluvial sand and gravel at base, grading upwards into fine sands and silts, local peat. May be overrun with recent sediments from forest cutting and agriculture.

Lithology: sand; gravel; silt; peat

Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area

Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided - Murphy Marble: calcareous to dolomitic; Andrews Formation: calcareous cross-biotite schist; Nottely Quartzite: meta-orthoquartzite with slate.

Lithology: marble; schist; quartzite; slate

Muscovite Granite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Muscovite Granite Gneiss

Lithology: granitic gneiss

Sericite Schist/ Amphibolite/ Granite gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Sericite Schist/ Amphibolite/ Granite gneiss

Lithology: schist; amphibolite; granitic gneiss

Mica Schist/ Metasiltstone (Precambrian-Paleozoic) at surface, covers 0.1 % of this area

Mica Schist/ Metasiltstone

Lithology: mica schist; metasedimentary rock

Aeolian sand deposits - parabolic dunes (Quaternary) at surface, covers < 0.1 % of this area

Aeolian sand deposits - parabolic dunes

Lithology: dune sand

Cusseta, Blufftown, and Eutaw Formations, undifferentiated (Cretaceous) at surface, covers 0.2 % of this area

Cusseta, Blufftown, and Eutaw Formations, undifferentiated

Lithology: sand; clay or mud

Tuscumbia Limestone and Fort Payne Chert undivided (Mississippian) at surface, covers < 0.1 % of this area

Tuscumbia Limestone and Fort Payne Chert undivided - Tuscumbia Limestone -- light-gray partly oolitic limestone; very coarse bioclastic crinoidal limestone common; light-gray chert nodules and concretions locally abundant. Fort Payne Chert -- very light to light-olive-gray, thin to thick-bedded fine to coarse-grained bioclastic (abundant pelmatozoans) limestone containing abundant nodules, lenses and beds of light to dark-grey chert. Upper part of formation locally consists of light-bluish-gray laminated siltstone containing vugs lined or filled with quartz and scattered throughout the formation are interbeds of medium to greenish-gray shale, shaly limestone and siltstone. Lenses of dark-gray siliceous shale occur locally at the base of the Fort Payne in Wills Valley. Commonly present below the Fort Payne is a ligh-olive-gray claystone or shale (Maury Formation) which is mapped with the Fort Payne. The Tuscumbia and Fort Payne are undifferentiated in Murphrees and Wills Valleys.

Lithology: limestone; chert; siltstone; shale; claystone

Metamorphosed granitoid rocks, undivided (Paleozoic to Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed granitoid rocks, undivided

Lithology: granitoid

Sandersville Limestone (Eocene) at surface, covers < 0.1 % of this area

Sandersville Limestone (Es)

Lithology: limestone

Chickamauga Group; Upper and Middle Ordovician Rocks (Omb) includes Moccasin Limestone and Bays Formation (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Upper and Middle Ordovician Rocks (Omb) includes Moccasin Limestone and Bays Formation.

Lithology: limestone; sandstone

Unnamed (upper part of Knox Group), including Newala Formation, Mascot Dolomite, Kingsport Formation, Longview Dolomite, and Chepultepec Dolomite (Ordovician) at surface, covers < 0.1 % of this area

(Onc) Unnamed (upper part of the Knox Group), including the (On) Newala Formation; (Oma) Mascot Dolomite - Light-gray, fine-grained, well-bedded cherty dolomite; mottled (red and green) dolomite characteristic; interbeds of bluish-gray limestone in upper part; chert-matrix quartz sandstone at base. Erosional unconformity at top. Thickness 350 to 800 feet; (Ok) Kingsport Formation - Gray, fine-grained, sparingly cherty dolomite with basal dense, gray limestone sequence. Thickness about 250 feet. and (Olc) Unnamed (middle part of the Knox Group), including (Olv) Longview Dolomite - Siliceous, gray, fine-grained, medium-bedded dolomite; interbeds of gray limestone in upper part. Thickness about 300 feet; (Oc) Chepultepec Dolomite - Light-gray, fine-grained, well-bedded dolomite, moderately cherty; fine-grained limestone locally in upper part; quartz sandstone beds at base. Average thickness about 800 feet.

Lithology: dolostone (dolomite); limestone; sandstone

Mafic Hornfels (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Mafic Hornfels

Lithology: hornfels

Copper Ridge Dolomite (Cambrian) at surface, covers < 0.1 % of this area

Copper Ridge Dolomite - Coarse, dark-gray, knotty dolomite, asphaltic in places, with much gray, medium-grained, well- bedded dolomite; abundant chert; cryptozoans typical. Thickness about 1,000 feet.

Lithology: dolostone (dolomite); chert

Rome Formation (Cambrian) at surface, covers < 0.1 % of this area

Rome Formation - variegated thinly interbedded mudstone, shale, siltstone, and sandstone; limestone and dolomite occur locally. Quartzose sandstone commonly present near top of formation.

Lithology: mudstone; shale; siltstone; sandstone; limestone; dolostone (dolomite)

Hornblende-Biotite Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Hornblende-Biotite Gneiss/ Amphibolite

Lithology: mafic gneiss; amphibolite

Socastee Formation (Pleistocene) at surface, covers < 0.1 % of this area

Socastee Formation: Low coastal formation in Carolinas like Penholoway but younger and lower in altitude.

Lithology: sand; clay or mud

Amphibolite/ Biotitic Gneiss/ Quartz Sericite Schist (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Amphibolite/ Biotitic Gneiss/ Quartz Sericite Schist

Lithology: amphibolite; biotite gneiss; schist

Selma Group; Providence Sand (Cretaceous) at surface, covers < 0.1 % of this area

Providence Sand - (Selma Group), Upper part consists of cross-bedded fine to coarse sand and white, dark-gray and pale-red-purple mottled clay containing lignite, sand, and kaolin; lower part consists of dark-gray laminated to thin-bedded silty clay and abundantly micaceous, carbonaceous, fossiliferous very fine to fine sand. The Providence Sand extends eastward from southeastern Lowndes County into Georgia.

Lithology: sand; clay or mud; silt; coal

Chickamauga Group; Middle Ordovician rocks; Athens Shale (Middle Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Middle Ordovician rocks; includes the Athens Shale (Oa)

Lithology: shale

Migmatitic granitoid gneiss (Ordovician) at surface, covers < 0.1 % of this area

Migmatitic granitoid gneiss: variably foliated, variably migmatitic, and granitic to quartz dioritic in composition

Lithology: granitic gneiss

Emuckfaw Group; Emuckfaw Group undifferentiated in part (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Emuckfaw Group undifferentiated in part - interbedded muscovite +/- garnet-biotite schist, metagraywacke, calc-silicate rock, and quartzite; rare thin amphibolite. Includes thin layers of aluminous graphitic schist. Locally sheared to mylonite schist.

Lithology: mica schist; metasedimentary rock; quartzite; calc-silicate rock; amphibolite

Nantahala Formation and Tusquitee Quartzite, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area

Nantahala Formation and Tusquitee Quartzite, undivided - Nantahala Formation: slate and metasiltstone, dark gray, laminated to thin bedded, sulfidic; Tusquitee Quartzite: white to light yellowish gray, numerous, thin slate layers.

Lithology: slate; metasedimentary rock; quartzite

Fort Payne Chert (Mississippian) at surface, covers < 0.1 % of this area

Fort Payne Chert (Mfp) with Lavender Shale Member (Mls)

Lithology: chert

Button Mica Schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Button Mica Schist

Lithology: mica schist

Lookout Sandstone; Sewanee Sandstone (Pennsylvanian) at surface, covers < 0.1 % of this area

Lookout Sandstone; Sewanee Sandstone

Lithology: conglomerate; sandstone

Waccamaw Formation (Pleistocene) at surface, covers < 0.1 % of this area

Waccamaw Formation: Another Carolina costalized terrace of early-middle Pleistocene age. Deeply weathered.

Lithology: sand; limestone

Granitic Gneiss / Gneissic Granite (augen or porphyritic) (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Granitic Gneiss / Gneissic Granite (augen or porphyritic)

Lithology: granitic gneiss; granite

Biotite Gneiss/ Hornblende Gneiss/ Granite Gneiss (Age not given) at surface, covers < 0.1 % of this area

Biotite Gneiss/ Hornblende Gneiss/ Granite Gneiss

Lithology: biotite gneiss; mafic gneiss; granitic gneiss

Amphibolite/ Ultramafic (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolite/ Ultramafic

Lithology: amphibolite

Graphite Schist (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Graphite Schist

Lithology: schist

Dadeville Complex; Waresville Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Waresville Schist - banded amphibolite interlayered with chlorite schist, chlorite amphibolite, chlorite-actinolite schist, chlorite +/- magnetite quartzite, and actinolite quartzite; may include small ultramafic pods.

Lithology: amphibolite; schist; quartzite; ultramfic intrusive rock

Mylonitic rocks of Modoc Fault Zone (Late Paleozoic) at surface, covers < 0.1 % of this area

Mylonitic rocks of Modoc Fault Zone: mylonite gneiss

Lithology: mylonite

Biotite quartz-plagioclase gneiss (Paleozoic or Neoproterozoic) at surface, covers < 0.1 % of this area

Biotite quartz-plagioclase gneiss: biotite quartz-plagioclase gneiss with minor interlayers of amphibolite gneiss and mica schist

Lithology: biotite gneiss; amphibolite; schist

Clayton Formation (Paleocene) at surface, covers < 0.1 % of this area

Clayton Formation

Lithology: sand; limestone; clay or mud

Coweeta Group; Amphibolite (Middle/Late Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Lithology: amphibolite; metasedimentary rock

Tidal Marsh (Quaternary) at surface, covers < 0.1 % of this area

Tidal Marsh: Peat and muck deposits along tidal margins of esturaries and back bays. Deposits range from a few feet to 60+ feet deep. Locally include silt and fine sand and clay as levees on tidal channels. At depth peaty material may be accumulated from fresh water plants. Peat at the surface dominated by spartina and other salt tolerant species.

Lithology: peat; silt; sand; clay or mud

Ottosee Shale (Ordovician) at surface, covers < 0.1 % of this area

Ottosee Shale - Bluish-gray calcareous shale, weathers yellow; with reef lenses of coarsely crystalline reddish fossiliferous limestone ("marble"). Thickness about 1,000 feet.

Lithology: shale; limestone

Princess Anne shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 0.2 % of this area

Princess Anne shoreline complex - marsh and lagoonal facies

Lithology: unconsolidated deposit

Granodiorite gneiss and granite gneiss (Devonian to Silurian) at surface, covers < 0.1 % of this area

Granodiorite gneiss and granite gneiss

Lithology: granitic gneiss

Claiborne Group; Gosport Sand and Lisbon Formation undifferentiated in part (Eocene) at surface, covers < 0.1 % of this area

Lisbon Formation undifferentiated in part - (Claiborne Group), greenish-gray calcareous, glauconitic, fossiliferous clayey sand; marl; carbonaceous sand; carbonaceous silty clay; and coarse glauconitic, fossiliferous, quartz sand.

Lithology: sand; clay or mud;

Rabun Gneiss (Ordovician) at surface, covers < 0.1 % of this area

Rabun Gneiss (450-500 my) - weakly to well foliated, granitic to quartz monzonitic.

Lithology: granitic gneiss

Metavolcanic and metasedimentary rocks of Bel Air Belt (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Metavolcanic and metasedimentary rocks of Bel Air Belt

Lithology: metavolcanic rock; metasedimentary rock

Quartzite/ Phyllite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Quartzite/ Phyllite

Lithology: quartzite; phyllite

Latimer complex of Griffin (1979) (Paleozoic or Neoproterozoic) at surface, covers < 0.1 % of this area

Latimer complex of Griffin (1979): metamorphosed mafic-ultramafic complex consisting mainly of mafic rocks including amphibolite, metagabbro, and greenstone metabasalt

Lithology: amphibolite; metamorphic rock; greenstone

Metagraywacke/ Mica Schist/ Calc-silicate Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Metagraywacke/ Mica Schist/ Calc-silicate Gneiss

Lithology: metasedimentary rock; mica schist; gneiss

Ocoee Supergroup, Great Smokey Group; Wehutty Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Wehutty Formation - slate to schist, dark gray, graphitic and sulfidic; includes mica schist, metagraywacke, and metaconglomerate.

Lithology: slate; schist; metasedimentary rock

Calc-silicate Granite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Calc-silicate Granite Gneiss

Lithology: granitic gneiss

Floyd Shale; unnamed limestone member (Mississippian) at surface, covers < 0.1 % of this area

Floyd Shale; unnamed limestone member (Ml in Floyd County) at the base

Lithology: shale; limestone

Aeolian sand deposits - formless deposits (Quaternary) at surface, covers < 0.1 % of this area

Aeolian sand deposits - formless deposits

Lithology: sand

Gneissic granite of Starr (Silurian to Ordovician) at surface, covers < 0.1 % of this area

Gneissic granite of Starr: gneissic biotite granite to granodiorite of Starr pluton and nearby satellite plutons

Lithology: granitic gneiss

Meta-ultramafic Rock (Paleozoic/Late Proterozoic) at surface, covers < 0.1 % of this area

Meta-ultramafic Rock - metamorphosed dunite and peridotite; serpentine, soapstone, and other altered ultramafic rock. Only larger bodies shown.

Lithology: metamorphic rock; serpentinite

Hawthorn Group, Statenville Formation (Miocene) at surface, covers < 0.1 % of this area

Hawthorn Group, Statenville Formation - The Statenville Formation occurs at or near the surface in a limited area of Hamilton, Columbia and Baker Counties on the northeastern flank of the Ocala Platform. The formation consists of interbedded sands, clays and dolostones with common to very abundant phosphate grains. The sands predominate and are light gray to light olive gray, poorly indurated, phosphatic, fine to coarse grained with scattered gravel and with minor occurrences of fossils. Clays are yellowish gray to olive gray, poorly consolidated, variably sandy and phosphatic, and variably dolomitic. The dolostones, which occur as thin beds, are yellowish gray to light orange, poorly to well indurated, sandy, clayey and phosphatic with scattered mollusk molds and casts. Phosphate occurs in the Statenville Formation in economically important amounts. Silicified fossils and opalized claystones are found in the Statenville Formation. Permeability of these sediments is generally low, forming part of the intermediate confining unit/aquifer system.

Lithology: sandstone; clay or mud; dolostone (dolomite)

Amphibolite / gabbro (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolite / gabbro

Lithology: amphibolite; gabbro

Beaverdam Amphibolite (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Beaverdam Amphibolite - dark-green to dark-gray hornblende amphibolite, extensively sheared and folded, and locally retrograded to actinolite-tremolite-chlorite schist. Includes all amphibolite associated with the Wedowee Group.

Lithology: amphibolite; schist

Amphibolitic Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolitic Schist/ Amphibolite

Lithology: amphibole schist; amphibolite

Amphibolite/ Metagraywacke/ Mica Schist (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Amphibolite/ Metagraywacke/ Mica Schist

Lithology: amphibolite; graywacke; schist

Tallahatta Formation (Eocene) at surface, covers < 0.1 % of this area

Tallahatta Formation

Lithology: limestone; sand; clay or mud

Holocene sediments (Holocene) at surface, covers < 0.1 % of this area

Holocene sediments - the Holocene sediments in Florida occur near the present coastline at elevations generally less than 5 feet (1.5 meters). The sediments include quartz sands, carbonate sands and muds, and organics.

Lithology: beach sand; clay or mud; biogenic sediment

Black Creek/Cusseta/Blufftown Formations (Cretaceous) at surface, covers < 0.1 % of this area

Black Creek/Cusseta/Blufftown Formations: Moderately to poorly sorted sand and clay deposited in delta-dominated shallow marine environments. Unit is characterized by sands containing locally abundant (F-VC grained) tourmaline and (F-VC grained) muscovite with some monazite and garnet. Clay layers are also common and some lower delta plain deposits form commercial kaolin bodies. Generally very restricted marine in eastern Georgia becoming more open marine to the east and west.

Lithology: sand; clay or mud

Hawthorn Group, Coosawhatchie Formation, Charlton Member (Miocene/Pliocene) at surface, covers < 0.1 % of this area

Hawthorne Group, Coosawhatchie Formation, Charlton Member - The Charlton Member (originally the Charlton formation, Veatch and Stevenson, 1911), crops out only in northern Nassau County near and along the St. Marys River. The Charlton Member in this area consists primarily of light gray to greenish gray, poorly to moderately consolidated, dolomitic to calcareous, silty, sandy, locally fossiliferous clays. Few carbonate beds occur.

Lithology: dolostone (dolomite); clay or mud; sand; limestone

Slate/ Quartzite/ Conglomerate (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Slate/ Quartzite/ Conglomerate

Lithology: slate; quartzite; conglomerate

Claiborne Group; Tallahatta Formation (Eocene) at surface, covers < 0.1 % of this area

Tallahatta Formation - (Claiborne group), White to very light-greenish-gray thin-bedded to massive siliceous claystone; interbedded with thin layers of fossiliferous clay, sandy clay, and glauconitic sand and sandstone. White to light-greenish-gray fine to coarse sand and fine gravel occur at the base of the formation in southwest Alabama (Meridian Sand Member).

Lithology: claystone; clay or mud; sand; sandstone; gravel

Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones - blastomylonite, mylonite gneiss, locally includes mylonite schist and mylonite quartzite in Towaliga fault zone.

Lithology: mylonite; gneiss; schist; quartzite

Midway Group; Clayton Formation (Paleocene) at surface, covers < 0.1 % of this area

Clayton Formation - (Midway Group), White to yellowsih-gray argillaceous limestone occurs in the upper part (McBryde Limestone Member): the lower part is medium-gray fossiliferous calcareous silt, glauconitic sand and thin beds of sandy limestone and calcareous sandstone (Pine Barren Member). At the base of the formation in southeast AL is a gravelly medium to coarse sand containing clay pebbles. The formation thins west of Wilcox County and westward from Thomaston in eastern Marengo County is mapped with the Porters Creek Formation. The formation is generally deeply weathered and fresh exposures are rare. In western areas exposures consist of weathered white to yellowish-gray argillaceous, fossiliferous sandy limestone, ferruginous sand, and fossiliferous sandstone. In eastern areas exposures consist of residual accumulations of chert boulders, moderate-reddish-orange sand, and clay containing masses and thin layers of iron minerals (limonite-goethite).

Lithology: limestone; clay or mud; silt; sandstone; chert

Conasauga Group; Upper unit; Dolostone member (Cambrian) at surface, covers < 0.1 % of this area

Conasauga Group; Upper unit; Dolostone member: Includes limestone and shale unit (Ccsl). Possible equivalent of the Maryville Limestone and Nolichucky Shale of Tennessee with a dolostone member (Ccd).

Lithology: dolostone (dolomite)

Uchee Complex; Phenix City Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Phenix City Gneiss - biotite-epidote quartz diorite gneiss and biotite-hornblende gneiss; locally includes migmatitic amphibolite; cut by numerous granitic veins.

Lithology: felsic gneiss; mafic gneiss; amphibolite; granite

Talladega Group; No name on map (Silurian?-Devonian) at surface, covers < 0.1 % of this area

No name on map - fossiliferous chert facies in vicinity of Jemison, Chilton County, contains marine invertabrate fossils of early to Middle Devonian age.

Lithology: chert

Metagraywacke undifferentiated (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Metagraywacke undifferentiated

Lithology: metasedimentary rock

Lenoir Limestone (Ordovician) at surface, covers < 0.1 % of this area

Lenoir Limestone - Nodular, argillaceous, gray limestone; in places basal sedimentary breccia, conglomerate, quartz sand; Mosheim Limestone Member (dense, light- to medium-gray limestone) near base. Thickness 25 to 500 feet.

Lithology: limestone; conglomerate; sand

Opelika Complex; Auburn Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Auburn Gneiss - fine-grained biotite-oligoclase gneiss intermixed with coarse-grained muscovite-biotite schist; locally contains muscovite-rich pegmatite.

Lithology: felsic gneiss; mica schist; pegmatite

Bangor Limestone (Mississippian) at surface, covers < 0.1 % of this area

Bangor Limestone - Medium-gray bioclastic and oolitic limestone, containing interbeds of dusky-red and olive-green mudstone in the upper part.

Lithology: limestone; mudstone

Walden Creek Group, including Sandsuck Formation, Wilhite Formation, Shields Formation, and Licklog Formation (Cambrian) at surface, covers < 0.1 % of this area

Walden Creek Group - The formations, other than the Sandsuck, are applicable mainly in the region of the Great Smoky Mountains. Thickness about 8,000 feet, Includes Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet; Wilhite Formation - Gray to green siltstone and slate with interbeds of pebble conglomerate, sandstone, and quartzite. Thickness about 4,000 feet; Shields Formation - Massive conglomerate, sandstone, argillaceous slate; conglomerate (pebbles of various rock types) characteristic. Thickness about 1,500 feet.; Licklog Formation - Feldspathic sandstone, greenish phyllite, and bluish-gray slate. Thickness about 1,500 feet.

Lithology: shale; siltstone; sandstone; conglomerate; slate; quartzite; phyllite

Cypresshead Formation (Pliocene) at surface, covers < 0.1 % of this area

Cypresshead Formation - The Cypresshead Formation named by Huddlestun (1988), is composed of siliciclastics and occurs only in the peninsula and eastern Georgia. It is at or near the surface from northern Nassau County southward to Highlands County forming the peninsular highlands. It appears that the Cypresshead Formation occurs in the subsurface southward from the outcrop region and similar sediments, the Long Key Formation, underlie the Florida Keys. The Cypresshead Formation is a shallow marine, near shore deposit equivalent to the Citronelle Formation deltaic sediments and the Miccosukee Formation prodeltaic sediments. The Cypresshead Formation consists of reddish brown to reddish orange, unconsolidated to poorly consolidated, fine to very coarse grained, clean to clayey sands. Cross bedded sands are common within the formation. Discoid quartzite pebbles and mica are often present. Clay beds are scattered and not areally extensive. In general, the Cypresshead Formation in exposure occurs above 100 feet (30 meters) above mean sea level (msl). Original fossil material is not present in the sediments although poorly preserved molds and casts of mollusks and burrow structures are occasionally present. The presence of these fossil "ghosts" and trace fossils documents marine influence on deposition of the Cypresshead sediments. The permeable sands of the Cypresshead Formation form part of the surficial aquifer system.

Lithology: sand; clay or mud

Emuckfaw Group; Glenloch Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Glenloch Schist - graphite-garnet-muscovite schist with interlayered metagraywacke.

Lithology: mica schist; metasedimentary rock

Conasauga Group; Lower unit; lower dolostone unit (Cambrian) at surface, covers < 0.1 % of this area

Conasauga Group; Lower unit; lower dolostone unit: Includes shale and sandstone unit (Ccs) with lower dolostone unit (Ccdl). Possible equivalent of Pumpkin Valley Shale of Tennessee

Lithology: dolostone (dolomite)

Motts Gneiss, Unnamed unit (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Motts Gneiss, Unnamed unit - unnamed unit comprised of masses of epidote-hornblende-oligoclase mylonitic gneiss and amphibolite.

Lithology: gneiss; amphibolite

Athens Shale (Ordovician) at surface, covers < 0.1 % of this area

Athens Shale - Medium- to dark-gray, calcareous, graptolitic shale; calcareous gray sandstone, siltstone, and locally fine-pebble quartz conglomerate; nodules of shaly limestone near base. Maximum thickness 1,500 feet.

Lithology: shale; sandstone; siltstone; conglomerate; limestone

Monteagle Limestone (Mississippian) at surface, covers < 0.1 % of this area

Monteagle Limestone - Light-gray oolitic limestone containing interbedded argillaceous, bioclastic, or dolomitic limestone, dolomite, and medium-gray shale.

Lithology: limestone; dolostone (dolomite); shale

Suwannee Limestone (Oligocene) at surface, covers < 0.1 % of this area

Suwannee Limestone - Peninsular Lower Oligocene carbonates crop out on the northwestern, northeastern and southwestern flanks of the Ocala Platform. The Suwannee Limestone is absent from the eastern side of the Ocala Platform due to erosion, nondeposition or both, an area referred to as Orange Island (Bryan, 1991). The Suwannee Limestone, originally named by Cooke and Mansfield (1936), consists of a white to cream, poorly to well indurated, fossiliferous, vuggy to moldic limestone (grainstone and packstone). The dolomitized parts of the Suwannee Limestone are gray, tan, light brown to moderate brown, moderately to well indurated, finely to coarsely crystalline, dolostone with limited occurrences of fossiliferous (molds and casts) beds. Silicified limestone is common in Suwannee Limestone. Fossils present in the Suwannee Limestone include mollusks, foraminifers, corals and echinoids.

Lithology: limestone; dolostone (dolomite)

Chickamauga Group; Holston Limestone (Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Holston Limestone

Lithology: limestone

Richtex Formation (Ordovician to Middle Cambrian) at surface, covers < 0.1 % of this area

Richtex Formation: laminated metamudstone; contains Middle Cambrian or younger sponge spicules

Lithology: metasedimentary rock

Bangor and Monteagle Limestones undivided in part (Mississippian) at surface, covers < 0.1 % of this area

Bangor and Monteagle Limestones undivided in part - Bangor Limestone -- medium-gray bioclastic and oolitic limestone, containing interbeds of dusky-red and olive-green mudstone in upper part. Monteagle Limestone -- light-gray oolitic limestone containing interbedded argillaceous, bioclastic, or dolomitic limestone, dolomite, and medium-gray shale.

Lithology: limestone; mudstone; dolostone (dolomite); shale

Chickamauga Group; Middle Ordovician rocks; Lenoir Limestone (Middle Ordovician) at surface, covers < 0.1 % of this area

Chickamauga Group; Middle Ordovician rocks; Lenoir Limestone

Lithology: limestone

Wilcox Group; Tuscahoma Sand (Paleocene) at surface, covers < 0.1 % of this area

Tuscahoma Sand - (Wilcox Group), Light-gray to light-olive-gray laminated and thin-bedded carbonaceous silt and clay interbedded with fine sand; thin lignite beds occur locally. Lower part of the formation includes beds of fossiliferous, glauconitic fine quartz sand containing speroidal sandstone concretions, gravel and clay pebbles.

Lithology: clay or mud; silt; sand; coal; sandstone; gravel

Residuum on Eocene sediments (Eocene) at surface, covers < 0.1 % of this area

Residuum on Eocene sediments - The post-Eocene residuum lying on Eocene sediments in the panhandle consists of reddish brown, sandy clays and clayey sands with inclusions of weathered Eocene limestones. Some of the inclusions are silicified carbonates.

Lithology: sand; clay or mud; limestone

Great Smoky Group, including Anakeesta Formation, Thunderhead Sandstone, and Elkmont Sandstone (Precambrian) at surface, covers < 0.1 % of this area

Great Smoky Group - Characterized by very massive layers of coarse graywacke and arkose. The formations have been mapped only in the region of the Great Smoky Mountains. Near Ducktown, in ascending order, the Copperhill, Hughes Gap, Hothouse, and Dean Formations are recognized. Thickness 14,000 to about 40,000 feet. Includes Anakeesta Formation - Dark-gray, bluish-gray, and black slate with dark-gray interbeds of fine-grained sandstone. Thickness 3,000 to 4,500 feet; Thunderhead Sandstone - Coarse, gray feldspathic sandstone, graywacke, and conglomerate; occurs in massive ledges; graded bedding and blue quartz characteristic. Thickness 5,500 to 6,300 feet; Elkmont Sandstone - Coarse to fine, gray feldspathic sandstone, graywacke, and fine conglomerate; generally finer grained beds in lower part; graded bedding typical. Thickness 1,000 to 8,000 feet

Lithology: graywacke; arkose; slate; sandstone; conglomerate

Coweeta Group (Late Proterozoic) at surface, covers < 0.1 % of this area

Coweeta Group - quartz dioritic gneiss, feldspar-quartz-biotite gneiss, metasandstone and quartzite, alumino-silicate schist, garnetiferous biotite gneiss, and minor amphibolite. Quartz dioritic gneiss predominant.

Lithology: gneiss; metasedimentary rock; quartzite; schist; amphibolite

Ashe Metamorphic Suite and Tallulah Falls Formation; Biotite gneiss (Late Proterozoic) at surface, covers < 0.1 % of this area

Biotite gneiss - interlayered with biotite-garnet gneiss, biotite-muscovite schist, garnet-mica schist, and amphibolite.

Lithology: biotite gneiss; mica schist; amphibolite

Chauga River Formation and Poor Mountain Formation, undivided (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Chauga River Formation and Poor Mountain Formation, undivided

Lithology: metasedimentary rock

Little Oak and Lenoir Limestones undifferentiated (Ordovician) at surface, covers < 0.1 % of this area

Little Oak and Lenoir Limestones undifferentiated - dark-gray argillaceous, fossiliferous medium to thick-bedded limestone; locally contains rare chert in upper part and an interval of fenestral mudstone in lower part (Mosheim Limestone Member of the Lenoir Limestone). Between Siluria and Pelham in Shelby County, the Little Oak and Lenoir Limestones are separated by a tongue of the Athens Shale.

Lithology: limestone; mudstone; chert

Pottsville Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Pottsville Formation - Light-gray thin to thick-bedded quartzose sandstone and conglomerate containing interbedded dark-gray shale, siltstone, and coal. Mapped on Lookout Mountain, Blount and Chandler Mountains, and Sand Mountain northeats of Blount County, and on the mountains of Jackson, Marshall and Madison Counties north and west of the TN river.

Lithology: sandstone; conglomerate; shale; siltstone; coal

Frog Mountain (Devonian) at surface, covers < 0.1 % of this area

Frog Mountain

Lithology: sandstone

Dadeville Complex; Agricola Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Agricola Schist - biotiite +/- garnet +/- sillimanite-feldspar-quartz schist, interlayered with thin-bedded dark-brown hornblende amphibolite; contains pegmatite pods and veins.

Lithology: quartz-feldspar schist; amphibolite; pegmatite

Penholoway Formation (Pleistocene) at surface, covers < 0.1 % of this area

Penholoway Formation: Similar to Cape May, broad lateral extent underlying terraces in the Carolinas; swamps and ridges on terrace surface were originally barrier islands and back bays. Superimposed on these landforms are swarms of Carolina bays.

Lithology: sand; clay or mud

Talladega Group; Lay Dam Formation (Silurian?-Devonian) at surface, covers < 0.1 % of this area

Lay Dam Formation (Talladega Group) - interbedded dark-green phyllite, medium-gray to light-brown and black metasiltstone, dark-green feldspathic metagraywacke, and light-gray and dark-gray medium to coarse-grained arkosic quartzite and metaconglomerate; graphitic phyllite common in upper part. In Cleburne and Calhoun Counties, rocks mapped as the Lay Dam include the Abel Gap Formation of Bearce (1973) and consist of interbedded greenish-gray metasiltstone and quartzite, black phyllitic metasiltstone, medium-gray to greenish-gray arkosic quartzite, and dark-gray pyritic quartzite. In Clay Chounty the upper part of the Lay Dam includes black graphitic sericite phyllite and slate reportedly containing plant fossils (Erin Slate Member).

Lithology: phyllite; metasedimentary rock; quartzite; slate; meta-conglomerate

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