Cook Mountain formation (MSEOcm;0)

State	Mississippi
Name	Cook Mountain formation
Geologic age	Eocene
Lithologic constituents	Major Unconsolidated > Coarse-detrital > SandCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand. Unconsolidated > MarlCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand. Minor Unconsolidated > Fine-detrital > ClayCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand. Incidental Sedimentary > Carbonate > LimestoneCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
Comments	Secondary unit descriptions from USGS Lexicon website (MS002) and MS004: The Cook Mountain Formation is best exposed in Newton Co., MS, on the south side of I-20 at the Newton exit, in NW1/4NE1/4 sec. 26, T6N, R11E. Varies in thickness in the subsurface, from 47 ft to 135 ft. Thickens downdip. Mapped as a single unit, but two members discussed in text: Potterchitto and Gordon Creek Shale. Basal Archusa Marl Member is not recognized in Newton Co., either at the surface or in the subsurface. Disconformably overlies the Kosciusko Formation and conformably underlies the Cockfield Formation. Age is middle Eocene. Geologic map. Measured section. Stratigraphic column (Merrill and others, 1985).
References	Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS., scale 1:500,000. USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/ https://ngmdb.usgs.gov/Geolex/search Merrill, R.K., Sims, J.J., Jr., Gann, D.E. and Liles, K.J., 1985, Newton County geology and mineral resources [Mississippi]: Mississippi Office of Geology Bulletin, no. 126, 108 p.
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Counties	Attala - Carroll - Clarke - Holmes - Jasper - Lauderdale - Leake - Madison - Newton - Scott

State

Name

Cook Mountain formation

Geologic age

Eocene

Lithologic constituents

Major

Unconsolidated > Coarse-detrital > SandCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.

Unconsolidated > MarlCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.

Minor

Unconsolidated > Fine-detrital > ClayCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.

Incidental

Sedimentary > Carbonate > LimestoneCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.

Comments

Secondary unit descriptions from USGS Lexicon website (MS002) and MS004: The Cook Mountain Formation is best exposed in Newton Co., MS, on the south side of I-20 at the Newton exit, in NW1/4NE1/4 sec. 26, T6N, R11E. Varies in thickness in the subsurface, from 47 ft to 135 ft. Thickens downdip. Mapped as a single unit, but two members discussed in text: Potterchitto and Gordon Creek Shale. Basal Archusa Marl Member is not recognized in Newton Co., either at the surface or in the subsurface. Disconformably overlies the Kosciusko Formation and conformably underlies the Cockfield Formation. Age is middle Eocene. Geologic map. Measured section. Stratigraphic column (Merrill and others, 1985).

References

Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS., scale 1:500,000.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search

Merrill, R.K., Sims, J.J., Jr., Gann, D.E. and Liles, K.J., 1985, Newton County geology and mineral resources [Mississippi]: Mississippi Office of Geology Bulletin, no. 126, 108 p.

NGMDB product

NGMDB product page for 16555

Counties

Attala - Carroll - Clarke - Holmes - Jasper - Lauderdale - Leake - Madison - Newton - Scott