| State | Arkansas |
|---|---|
| Name | Midway Group |
| Geologic age | Paleocene |
| Lithologic constituents |
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Unconsolidated > Marl (Bed)
Minor
Unconsolidated > Coarse-detrital > Sand
Sedimentary > Carbonate > Limestone (Bed)
|
| Comments | Mainly clay, calcareous clay (marl), sandy clay, calcareous sandstone and glauconitic limestone. Approximatly 640 ft. thick. Marine fossils are common. Marl refers to loosley consolidated calcareous clays, silts and sands containing glauconite |
| Stratigraphic units | Includes Porter Creek Clay and Clayton Formation. |
| References | Dane, C.H.,1929, Upper Cretaceous formations of southwestern Arkansas: Arkansas Geol. Survey Bull.1, 215 pp.Gordon, M., Jr; Tracey, J.I., Jr; and Ellis, M.W., 1958, Geology of the Arkansas bauxite region: U. S. Geological Survey Professional Paper, Report: P 0299, 268 pp.https://pubs.er.usgs.gov/publication/pp299 |
| NGMDB product | |
| Counties | Clark - Hempstead - Hot Spring - Jackson - Lonoke - Miller - Nevada - Pulaski - Saline |