Coosawhatchie Formation
| Coosawhatchie Formation | |
|---|---|
| Stratigraphic range: Miocene | |
| Type | Geological formation |
| Unit of | Hawthorn Group |
| Sub-units | Charlton Member |
| Lithology | |
| Primary | Sand, clay, limestone, dolomite, phosphate clay |
| Location | |
| Region | North Florida |
| Country |  United States |
| Type section | |
| Named for | Coosawhatchie River |
| Named by | Dall and Stanley-Brown (1894) |
The Coosawhatchie Formation is a
.Age
Location
The Coosawhatchie Formation is located on the eastern flank of the Ocala Platform near southern Columbia County and southern Marion County, Florida. It extends south-southeast and is present in Alachua, Marion, Sumter, and Lake County. It is exposed or lies beneath a thin overburden.
Lithography
The Coosawhatchie Formation varies in color from a light gray to olive gray. It is poorly consolidated, variably clayey and
.Silicified nodules are often present in the sediments and may contain 20% or more
Members
Charlton Member outcrops in just one location, that being northern
Fossils
Few to no fossils and mostly contained in the Charlton Member.
References
- Scott, T. M., The lithostratigraphy of the Hawthorn Group (Miocene) of Florida: Florida Geological Survey Bulletin 59, 148 p. 1988.
- Veatch, O., and Stevenson, L. W., 1911, Geology of the coastal plain of Georgia: Georgia Geologic Survey Bulletin 26, 466 p.
- USGS: Florida Geology Archived 2009-11-28 at the Wayback Machine