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 Eocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Silt (Bed)
Incidental
Sedimentary > Coal > Lignitelignitic clays, silts, and sands
Comments Upper member of the Claiborne Group
References

Snead, J.I., and Mcculloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey, scale 1:500,000.

NGMDB product
Counties Bienville - Caldwell - Claiborne - Grant - Jackson - La Salle - Lincoln - Natchitoches - Ouachita - Sabine - Union - Webster - Winn