| State | Arkansas |
|---|---|
| Name | Jackson Group |
| Geologic age | Late Eocene |
| Lithologic constituents |
Major
Unconsolidated > Marl (Bed)
Minor
Unconsolidated > Coarse-detrital > Sand (Bed)
Unconsolidated > Fine-detrital > Silt (Bed)
|
| Comments | Mainly marl- fossiliferous calcareous glauconitic clay/interbedded with fossiliferous argillaceous sand and silty clay. White Bluff FM dominates over Redfield FM in thickness and extent. Transgressional marine-nonmarine sequence. Marl refers to loosley consolidated calcareous clays, silts and sands containing glauconite. Includes White Bluff FM (marine)- Caney Point member, Pastoria Sand member, Rison Clay member and Redfield FM (nonmarine) fossiliferous lignitic silt and sand. |
| Stratigraphic units | White Bluff Formation, Caney Point member, Pastoria Sand member, Rison Clay member, and Redfield Formation |
| References | Wilbert, L.J. Jr. 1953, The Jacksonian Stage in southeastern Arkansas: Ark. Res. Devel. Comm., Div. Geology Bull. 19, 125 pp. |
| NGMDB product | |
| Counties | Ashley - Bradley - Cleveland - Drew - Grant - Jefferson - Lincoln |