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Geologic units in Missouri (state in United States)

Additional scientific data in this geographic area

HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 18 % of this area

HOLOCENE SERIES - Alluvium - clay, silt, sand, and gravel

Lithology: clay or mud; silt; sand; gravel

MARMATON GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers 12 % of this area

MARMATON GROUP - cyclic deposits, shale and limestone with sandstone, clay and several coal beds, some workable

SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 8 % of this area

SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE - fine crystalline, silty, cherty dolomite, and oolitic chert with local sandstone beds

ROUBIDOUX FORMATION (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 6 % of this area

ROUBIDOUX FORMATION - sandstone, chert and interbedded dolomite

CHEROKEE GROUP- Cabaniss Subgroup, Krebs Subgroup (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers 6 % of this area

CHEROKEE GROUP - Cabaniss Subgroup - cyclic deposits, shale, sandstone, clay and several workable coal beds. Krebs Subgroup - cyclic deposits, sandstone, siltstone, shale, clay and some workable coal beds

OSAGEAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Osagean]) at surface, covers 5 % of this area

OSAGEAN SERIES - KEOKUK LIMESTONE, BURLINGTON LIMESTONE, ELSEY FORMATION, REEDS SPRING FORMATION, PIERSON LIMESTONE, FERN GLEN FORMATION

MERAMECIAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late [Meramecian]) at surface, covers 5 % of this area

MERAMECIAN SERIES - ST. LOUIS LIMESTONE, SALEM FORMATION, WARSAW FORMATION

Lithology: limestone

RIVERTON FORMATION, BURGNER FORMATION (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atokan]) at surface, covers 5 % of this area

RIVERTON FORMATION - shale, clay, coal. BURGNER FORMATION - limestone

EMINENCE DOLOMITE, POTOSI DOLOMITE (Phanerozoic | Paleozoic | Cambrian-Furongian [Croixian]) at surface, covers 5 % of this area

EMINENCE DOLOMITE - dolomite with some druse - coated chert. POTOSI DOLOMITE - dolomite with abundance of druse - coated chert.

PLEASANTON GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Missourian]) at surface, covers 4 % of this area

PLEASANTON GROUP - dominantly shale and sandstone with minor coal.

Lithology: shale; sandstone; coal

WABAUNSEE GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Virgilian]) at surface, covers 3 % of this area

WABAUNSEE GROUP - cyclic deposits, principally shale, sitlstone, sandstone with thin limestone beds and minor coal

GASCONADE DOLOMITE (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 3 % of this area

GASCONADE DOLOMITE - coarse - crystalline cherty dolomite with a basal Gunter Sandstone Member.

KINDERHOOKIAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Kinderhookian]) at surface, covers 3 % of this area

KINDERHOOKIAN SERIES - NORTHVIEW SHALE, SEDALIA FORMATION, COMPTON LIMESTONE, BACHELOR FORMATION CHOUTEAU GROUP, HANNIBAL SHALE, HORTON CREEK LIMESTONE

SHAWNEE GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Virgilian]) at surface, covers 2 % of this area

SHAWNEE GROUP - cyclic deposits, limestone and shale with sandstone and siltstone.

KANSAS CITY GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Missourian]) at surface, covers 1 % of this area

KANSAS CITY GROUP - cyclic deposits, limestone and shale with minor sandstone and coal.

Lithology: limestone; shale; sandstone; coal

PENNSYLVANIAN UNDIFFERENTIATED (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 1 % of this area

PENNSYLVANIAN UNDIFFERENTIATED

Lithology: shale; limestone; sandstone; coal

WELDON RIVER-WARRENSBURG-MOBERLY CHANNEL SANDSTONE (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Missourian]) at surface, covers 1 % of this area

WELDON RIVER - WARRENSBURG - MOBERLY CHANNEL SANDSTONE

Lithology: sandstone

LANSING GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Missourian]) at surface, covers 1 % of this area

LANSING GROUP - cyclic deposits of limestone and shale

Lithology: shale; limestone; sandstone

ST. FRANCOIS MOUNTAINS VOLCANIC SUPERGROUP (Precambrian [Y]) at surface, covers 1 % of this area

ST. FRANCOIS MOUNTAINS VOLCANIC SUPERGROUP (chiefly alkali rhyolitic ash - flow tuffs, lava flows, and bedded tuffs, with minor trachytes.

Lithology: rhyolite; trachyte

DEVONIAN SYSTEM (Phanerozoic | Paleozoic | Devonian-Early Devonian-Middle(?) Devonian-Late) at surface, covers 1 % of this area

DEVONIAN SYSTEM - CHATTANOOGA SHALE, SYLAMORE SANDSTONE, FORTUNE FORMATION, HOLTS SUMMIT SANDSTONE, SNYDER CREEK SHALE, CEDAR VALLEY LIMESTONE, LOUISIANA LIMESTONE, SAVERTON SHALE, GRASSY CREEK SHALE, TURPIN SANDSTONE, BUSHBERG SANDSTONE, GLEN PARK LIMESTONE, St. LARENT LIMESTONE, BEAUVAIS SANDSTONE, GRAND TOWER LIMESTONE, CLEAR CREEK CHERT, LITTLE SALINE LIMESTONE, GRASSY KNOB CHERT, BAILEY FORMATION

LEEMON FORMATION, MAQUOKETA GROUP, CAPE LIMESTONE, KIMMSWICK LIMESTONE, NOIX-CYRENE LIMESTONE, MAQUOKETA SHALE (Phanerozoic | Paleozoic | Ordovician-Middle Ordovician-Late) at surface, covers 1 % of this area

LEEMON FORMATION, MAQUOKETA GROUP INCLUDING: (GIRARDEAU LIMESTONE, ORCHARD CREEK SHALE, THEBES SANDSTONE, CAPE La CROIX SHALE), CAPE LIMESTONE, KIMMSWICK LIMESTONE, NOIX - CYRENE LIMESTONE, MAQUOKETA SHALE

Lithology: limestone; shale; sandstone

DECORAH GROUP, PLATTIN GROUP (Phanerozoic | Paleozoic | Ordovician-Middle [Mohawkian]) at surface, covers 1.0 % of this area

DECORAH GROUP, PLATTIN GROUP

Lithology: limestone; shale

DOUGLAS GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Virgilian]) at surface, covers 0.9 % of this area

DOUGLAS GROUP - cyclic deposits, dominantly shale with sandstone, and limestone.

Lithology: shale; sandstone; limestone; coal

ELVINS GROUP- (INCLUDING DERBY-DOERUN DOLOMITE, DAVIS FORMATION), BONNETERRE DOLOMITE (Phanerozoic | Paleozoic | Cambrian-Furongian [Croixian]) at surface, covers 0.8 % of this area

ELVINS GROUP - (INCLUDING DERBY - DOERUN DOLOMITE - alternating thin dolomite, siltstone, and shale; DAVIS FORMATION - glauconitic shale with fine - grained sandstone, limestone, and dolomite); BONNETERRE DOLOMITE - dolomite, dolomitic limestone, and limestone; glauconitic in lower part

ST. PETER SANDSTONE, EVERTON FORMATION (Phanerozoic | Paleozoic | Ordovician-Early Ordovician-Middle) at surface, covers 0.7 % of this area

ST. PETER SANDSTONE, EVERTON FORMATION

LAMOTTE SANDSTONE (Phanerozoic | Paleozoic | Cambrian-Furongian [Croixian]) at surface, covers 0.7 % of this area

LAMOTTE SANDSTONE - sandstone with some dolomitic and shaly lenses; coarse - graines to conglomeratic and arkosic at base

Lithology: sandstone

CHANNEL SANDSTONES (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 0.5 % of this area

CHANNEL SANDSTONES

Lithology: sandstone

TERTIARY SYSTEM (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene(?) Oligocene(?) Miocene(?) Pliocene-Early(?) Pliocene-Middle(?) Pliocene-Late) at surface, covers 0.5 % of this area

TERTIARY SYSTEM - PLIOCENE SERIES - Mounds Gravel (Lafayette Formation) - ferruginous, chert gravel, max of 60 ft. EOCENE SERIES - Wilcox Group - includes Holly Springs Formation - x - bedded sandstone, clay and gravel, max of 1200 ft.; Ackerman Formation - clay with lens of sand and gravel, max of 100ft. PALEOCENE SERIES - Midway Group - includes Porters Creek Clay - bentonitic clay, max of 200 ft.; Clayton Formation - marl, fossiliferous, calcareous, limonitic, glauconitic sand and clay, max of 20 ft.,

GULFIAN SERIES (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.5 % of this area

GULFIAN SERIES - Owl Creek Formation - massive, sandy, micaceous, fossilliferous, glauconitic marine clay, max 100 ft. McNairy Formation - unconsolidated sandstone with clay and gravel lenses, max of 250 ft.

ST. FRANCOIS MOUNTAINS INTRUSIVE SUITE (SUBVOLCANIC, ALKALI GRANITIC RING COMPLEXES) (Precambrian [Y]) at surface, covers 0.5 % of this area

ST. FRANCOIS MOUNTAINS INTRUSIVE SUITE (SUBVOLCANIC, ALKALI GRANITIC RING COMPLEXES)

Lithology: granite

SILURIAN SYSTEM (Phanerozoic | Paleozoic | Silurian-Early Silurian-Middle(?) Silurian-Late) at surface, covers 0.4 % of this area

SILURIAN SYSTEM - JOLIET LIMESTONE, BOWLING GREEN DOLOMITE, BRYANT KNOB FORMATION, BAINBRIDGE FORMATION, SEXTON CREEK LIMESTONE

JOACHIM DOLOMITE, DUTCHTOWN FORMATION (Phanerozoic | Paleozoic | Ordovician-Middle [Mohawkian]) at surface, covers 0.3 % of this area

JOACHIM DOLOMITE, DUTCHTOWN FORMATION

CHESTERIAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late [Chesterian]) at surface, covers 0.2 % of this area

CHESTERIAN SERIES - FAYETTEVILLE FORMATION, BATESVILLE FORMATION, HINDVILLE LIMESTONE, VIENNA LIMESTONE, TAR SPRINGS SANDSTONE, GLEN DEAN FORMATION, HARDINSBURG FORMATION, GOLCONDA FORMATION, CYPRESS FORMATION, PAINT CREEK FORMATION, YANKEETOWN SANDSTONE, RENAULT FORMATION, AUX VASES SANDSTONE, STE. GENEVIEVE LIMESTONE

UNDIFFERENTIATED (Phanerozoic | Paleozoic | Ordovician) at surface, covers 0.1 % of this area

UNDIFFERENTIATED (ORDOVICIAN ROCKS)

Cotter and Jefferson City Dolomites (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers < 0.1 % of this area

Cotter and Jefferson City Dolomites

DIABASE DIKES AND SILLS (Precambrian [Y]) at surface, covers < 0.1 % of this area

DIABASE DIKES AND SILLS

Lithology: diorite; gabbro

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers < 0.1 % of this area

Terrace deposits - Alluvial deposits on one or more terrace levels

Lithology: alluvial terrace

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series (Mississippian) at surface, covers < 0.1 % of this area

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series

Ancell Group (Ordovician) at surface, covers < 0.1 % of this area

Ancell Group

Lower Valmeyeran (Keokuk-Sedalia) Series (Mississippian) at surface, covers < 0.1 % of this area

Lower Valmeyeran (Keokuk-Sedalia) Series

Lithology: limestone; shale

Galena-Platteville Groups (Ordovician) at surface, covers < 0.1 % of this area

Galena-Platteville Groups

Cherokee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers < 0.1 % of this area

Cyclic deposits with carbonaceous shale, clay, siltstone, with lesser sandstone, and thick coal beds; minor but persistent limestone beds; may include parts of Atoka or Morrow Series.

Keokuk and Reeds Spring Formations and St. Joe Group (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early) at surface, covers < 0.1 % of this area

TULSA- "Keokuk Formation," chert and limestone. "Reeds Spring Formation," chert and limestone. "St. Joe Group," limestone and shale. FORT SMITH- Mkr "Keokuk Formation," chert; "Reeds Spring Formation," chert and limestone; and "St. Joe 'Group,'" limestone and marlstone.

Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east) Series (Mississippian) at surface, covers < 0.1 % of this area

Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east) Series

Lithology: limestone; siltstone; shale

Wabaunsee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgil]) at surface, covers < 0.1 % of this area

Cyclic deposits, principally shale with limestone, siltstone, minor sandstone units and thin coal seams.

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

Alluvial deposits of local streams or of overbank flow of major streams - In some areas includes deposits in abandoned meanders of major streams

Lithology: alluvium

Dune sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers < 0.1 % of this area

Dune sand - Deposited mostly on terrace deposits of the second level. Younger than some terrace deposits, older than others

Lithology: dune sand

Marmaton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers < 0.1 % of this area

Alternating shale and limestone, with some sandstone and coal; Lenapah FM at top and Fort Scott at base.

Lithology: shale; limestone; sandstone; coal

Alluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

unconsolidated sand, silt, clay, and gravel

Lithology: gravel; sand; silt; clay or mud

Marmaton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Desmoinesian]) at surface, covers < 0.1 % of this area

Includes: Lost Branch FM, Memorial Shale, Lenapah Limestone (base LE), Nowata Shale, Altamont Limestone (base PA), Bandera Shale, Pawnee Limestone (base PA), Labette Shale and Fort Scott Limestone.

Lithology: shale; limestone; sandstone; coal

Shawnee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgil]) at surface, covers < 0.1 % of this area

Cyclic deposits with prominent limestone beds and thin shales; Topeka Formation at top and Oread Formation at base.

Lithology: limestone; shale

Meramecian and Osagian Series: Warsaw Limestone and Keokuk Limestone (Phanerozoic | Paleozoic | Carboniferous Mississippian [Osagian]) at surface, covers < 0.1 % of this area

Warsaw Limestone- semigranular limestone interlaminated with saccharoidal dolomite with large amounts of gray chert; glauconite occurrs in the lower part. Keokuk Limestone- white tripolitic, chert, siliceous limestone, and dolomite

Douglas Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgilian]) at surface, covers < 0.1 % of this area

Lawrence FM (base LA)- mostly gray shale and sandstone with minor red shale, coal, gray limestone and conglomerate, thickness ranges from 140ft to 250 ft. Stranger FM- five members containing sandstone, shale, and minor limestone, coal and conglomerate ranging from 100 ft. to 180 ft. thickness.

Kansas City Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Missourian]) at surface, covers < 0.1 % of this area

Includes: Lane Shale,Wyandotte Limestone (base WY), Liberty Memorial Shale, Iola Limestone (base I), Chanute Shale (base CH), Dewey Limestone, Nellie Bly FM, Cherryvale FM, Dennis Limestone (base DN), Galeburg Shale, Mound Valley Limestone, Ladore Shale, Swope Limestone (base SW), Elm Branch Shale, Hertha Limestone.

Lithology: limestone; shale; sandstone; coal

Boone Formation (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Meramecian Osagean]) at surface, covers < 0.1 % of this area

Boone Formation

Lithology: limestone; chert; shale

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

Alluvial Deposits - Sand, silt, clay, and gravel. In flood plain of Mississippi River more than 100 feet thick; in smaller streams generally less than 20 feet thick.

Lithology: sand; silt; clay or mud; gravel

Pleasanton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Missourian]) at surface, covers < 0.1 % of this area

Includes: Shale Hill FM (base SH), and Hepler FM. Chiefly gray to very dark gray or yellowish gray shale with sandstone members and some limestone and coal.

Lithology: shale; sandstone; limestone; coal

Alluvium and terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

Alluvium and terrace deposits - Alluvial deposits of present streams and on one or more terrace levels

Lower Chesterian (Glen Dean - Renault) Series (Mississippian) at surface, covers < 0.1 % of this area

Lower Chersterian (Glen Dean - Renault) Series

Alluvium (Pleistocene to Holocene) at surface, covers < 0.1 % of this area

Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks

Lithology: sand; silt; glacial drift

Sand and clay (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Sand and clay

Lithology: sand; clay or mud

Maquoketa Group (Ordovician) at surface, covers < 0.1 % of this area

Maquoketa Group

Lithology: shale; limestone; siltstone

Powell Dolomite (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers < 0.1 % of this area

Powell Dolomite

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

Silurian

Pitkin Limestone, Fayetteville Shale (including the Wedington Sandstone member), and Batesville Sandstone (including the Hindsville Limestone Member) (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late [Chesterian]) at surface, covers < 0.1 % of this area

Pitkin Limestone, Fayetteville Shale (including the Wedington Sandstone member), and Batesville Sandstone (including the Hindsville Limestone Member)

Lithology: sandstone; shale; limestone

Pleasanton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Missouri]) at surface, covers < 0.1 % of this area

Shale with some sandstone, thin limestone beds and minor coal; Exline Limestone near top Chariton Conglomerate at base. .

Lithology: shale; sandstone; limestone; coal

Kinderhookian Series (Mississippian) at surface, covers < 0.1 % of this area

Kinderhookian Series

Lithology: limestone; shale; siltstone

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

Upper Devonian

Pitkin + Fayetteville + Batesville + Hindsville + Moorefield Formations (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late) at surface, covers < 0.1 % of this area

TULSA- "Pitkin Formation," limestone. "Fayetteville Formation," shale and thin limestone "Batesville Formation," fine-grained sandstone "Hindsville Formation," limestone and shale "Moorefield Formation," limestone, shale, and siltstone.

Cherokee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Desmoinesian]) at surface, covers < 0.1 % of this area

Includes: Cabaniss FM (base CA) with Verdigris Limestone Member (base V) and Mineral coal bed (base MC), Krebs FM with Bluejacket Sandstone Member (base BJ) and Warner Sandstone Member (base WR).

Lithology: sandstone; shale; limestone; coal

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

Middle Devonian

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian) (Phanerozoic | Paleozoic | Devonian-Early Devonian-Middle(?) Devonian-Late(?) Carboniferous Mississippian-Early) at surface, covers < 0.1 % of this area

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian)

Osage Series (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early) at surface, covers < 0.1 % of this area

Warsaw Formation- gray, dolomitic shale and argillaceous dolomite; chalcedonic chert. Locally contains many geodes.Approx thickness 85 ft. Keokuk Limestone- fossiliferous, gray or brown limestone and dolomite; gray and brown chert with white spicules, locally predominant in lower portion; minor brown or gray shale. Approx thickness 90 ft. Burlington Limestone- gray, fossiliferous limestone and darker gray dolomite; white and gray mottled fossiliferous chert, locally contains dolomite crystals; two widespread glauconite zones; basal sandstone locally in southeastern Iowa. Approx thickness 80 ft.

Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

WOODWARD- Lenticular and interfingering deposits of gravel, sand, silt, and clay. Generally light-tan to gray. Thickness along major streams ranges up to 100 feet and probably averages 40 feet; along minor streams the thickness ranges up to 45 feet and probably averages 20 feet. ENID- Sand, silt, clay, and locally gravel. Maximum thickness ranges from 30 to 80 feet (9 to 24 m) along major streams and from 0 to 60 feet (0 to 18 m) along minor streams. TULSA- Gravel, sand, silt, and clay. TULSA- Gravel, sand, silt, and clay. OKLAHOMA CITY- Sand, silt, clay, and lenticular beds of gravel. Thickness ranges from about 30 to 100 feet and probably averages about 50 feet along major streams. Along minor streams, thickness ranges from a few feet to about 50 feet and probably averages about 25 feet. LAWTON- Sand, clay, and gravel as much as 50 feet (15 m) thick; Shown only along major streams and tributaries . ARDMORE-SHERMAN- Gravel, sand, silt, and clay, including low terraces; thickness, about 25 to 100 feet. McALESTER TEXARKANA- Gravel, sand, silt, and clay, including low terraces about 30 feet above channels; thickness, about 50 feet along Little River and 110 feet along Red River

Lithology: alluvium

Meramec Series (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late) at surface, covers < 0.1 % of this area

Ste. Genevieve Limestone- fossiliferous limestone and red and green shale. Approx. thickness 50 ft. St. Louis Limestone- limestone and dolomite, sandstone locally perdominant; locally contains chert. Spergen Formation- sandy micaceous dolomite.

Loess (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

eolian silts

Lithology: silt