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Cockfield Formation

brown lignitic clays, silts and sands; some sideritic glauconite may weather to brown ironstone in lower part.
State Louisiana
Name Cockfield Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Comments Upper member of the Claiborne Group
Primary rock type clay or mud
Secondary rock type silt
Other rock types sand
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Bed)
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Clay (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/.
Counties Bienville - Caldwell - Claiborne - Grant - Jackson - La Salle - Lincoln - Natchitoches - Sabine - Union - Webster - Winn