Jackson Group

Jackson Group
State Arkansas
Name Jackson Group
Geologic age Late Eocene
Lithologic constituents
Unconsolidated > Marl (Bed)
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

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