Yazoo Clay
| Yazoo Clay | |
|---|---|
| Type | Formation |
| Unit of | Jackson Group |
| Sub-units | North Twistwood Creek Member, Cocoa Sand Member, Pachuta Marl Member, and Shubuta Member |
| Overlies | Moodys Branch Formation |
| Lithology | |
| Primary | clay |
| Other | sand, marl |
| Location | |
| Region |
   |
| Country | United States |
| Type section | |
| Named for | Yazoo River |
Yazoo Clay is a clay geologic formation in Alabama, Louisiana, and Mississippi. It was named after a bluff along the Yazoo River at Yazoo City, Mississippi[1] It contains is a type of clay known as montmorillonite, making it a poor foundation material due to the fact that moisture causes extreme changes in volume. Sand, pyrite, and marl have all been noted in the formation. It preserves fossils from the Eocene, including the prehistoric cetacean Basilosaurus [1].
See also
References
- 1 2 Monroe, Watson H. (1954). "Geology of the Jackson Area Mississippi" (PDF). United States Geological Survey Bulletin. 986: 56–62. Retrieved 27 June 2018.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.
- Hosman, R.L. (1996). "Regional Stratigraphy and Subsurface Geology of Cenozoic Deposits, Gulf Coastal Plain, South-Central United States" (PDF). United States Geological Survey Professional Paper. 1416-G: G22.
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