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Cook Mountain Formation

greenish gray sideritic clay in upper part may weather to brown ironstone; yellow to brown clays and fossiliferous marl in lower part may weather to black soil. Ironstone concretions near base.
StateLouisiana
NameCook Mountain Formation
Geologic agePhanerozoic | Cenozoic | Tertiary | Eocene
Original map labelEcm
CommentsMember of the Claiborne Group
Primary rock typeclay or mud
Secondary rock typeunconsolidated deposit
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Marl (Bed)
Map references
United States Geological Survey, 1998, Digital Overlay of the Geologic Map of Louisiana: U.S. Geological Survey, Biological Resources Division, National Wetlands Research Center, Product Id USGS-NWRC 1984-02-0001, http://www.nwrc.usgs.gov/.
Unit references
United States Geological Survey, 1998, Digital Overlay of the Geologic Map of Louisiana: U.S. Geological Survey, Biological Resources Division, National Wetlands Research Center, Product Id USGS-NWRC 1984-02-0001, http://www.nwrc.usgs.gov/.
Geographic coverageBienville - Bossier - Claiborne - Jackson - Lincoln - Natchitoches - Ouachita - Sabine - Union - Webster - Winn

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