| State | Louisiana |
|---|---|
| Name | Cook Mountain Formation |
| Geologic age | Eocene |
| Lithologic constituents |
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Marl (Bed)
Incidental
Sedimentary > Chemical > Banded-iron-formation (Bed)glauconitic clay in upper part may weather to brown ironstone; ironstone concretions near base
|
| Comments | 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 - Bossier - Claiborne - Jackson - Lincoln - Natchitoches - Ouachita - Sabine - Union - Webster - Winn |