Geologic units in Murray county, Georgia

Additional scientific data in this geographic area

Conasauga Group; Lower unit; shale and sandstone unit (Cambrian) at surface, covers 27 % of this area

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

Slate/ Quartzite/ Conglomerate (Precambrian-Paleozoic) at surface, covers 27 % of this area

Slate/ Quartzite/ Conglomerate

Knox Group undifferentiated (Ordovician-Cambrian) at surface, covers 13 % of this area

Knox Group undifferentiated

Conasauga Group; Upper unit; limestone and shale unit (Cambrian) at surface, covers 12 % of this area

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

Quartzite/ Metagraywacke (Precambrian-Paleozoic) at surface, covers 3 % of this area

Quartzite/ Metagraywacke

Chickamauga Group; Middle Ordovician rocks; Athens Shale (Middle Ordovician) at surface, covers 3 % of this area

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

Phyllite and Quartzite (Precambrian-Paleozoic) at surface, covers 3 % of this area

Phyllite and Quartzite

Conasauga Group; Middle unit; Limestone unit (Cambrian) at surface, covers 2 % of this area

Includes limestone unit (Ccls), possible equivalent of Rutledge Limestone of Tennessee and shale unit (Cc), possible equivalent of Rogersville Shale of Tennessee

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

Metagraywacke/ Mica Schist-Quartzite/ Amphibolite

Newala Limestone (Ordovician) at surface, covers 2 % of this area

Newala Limestone

Conasauga Group; Maynardville Limestone (Cambrian) at surface, covers 1 % of this area

Conasauga Group; Maynardville Limestone

Conglomerate (Precambrian-Paleozoic) at surface, covers 0.8 % of this area

Conglomerate

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 0.8 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Chickamauga Group; Chota Formation (Ordovician) at surface, covers 0.8 % of this area

Chickamauga Group; Chota Formation

Chilhowee Formation (Cambrian) at surface, covers 0.4 % of this area

Includes Weisner Formation of Kesler, 1950

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

Metagraywacke/ Mica Schist

Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Ultramafic rocks undifferentiated

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

Rome Formation

Walden Creek Group; Sandsuck Formation (Precambrian) at surface, covers 0.2 % of this area

Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet.

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.

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

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.

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.

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

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

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

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

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

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.