Wilcox Group
The Wilcox Group is an important geologic group in the Gulf of Mexico Basin and surrounding onshore areas from Mexico and Texas to Louisiana and Alabama. The group ranges in age from Paleocene to Eocene and is in Texas subdivided into the Calvert Bluff, Simsboro and Hooper Formations, and in Alabama into the Nanafalia and Hatchetigbee Formations. Other subdivisions are the Lower, Middle and Upper Wilcox Subgroups, and the Carrizo and Indio Formations.
| Wilcox Group | |
|---|---|
| Stratigraphic range: Selandian-Ypresian ~ | |
| Type | Geologic group |
| Unit of | Gulf of Mexico Basin |
| Sub-units | Calvert Bluff, Simsboro & Hooper Formations (Texas) Nanafalia, Hatchetigbee Formation (Alabama) |
| Underlies | Claiborne Group |
| Overlies | Midway Group |
| Thickness | up to 1,800 ft (550 m) |
| Lithology | |
| Primary | Mudstone, sandstone, lignite |
| Other | Siltstone |
| Location | |
| Location | Gulf Coast and Mississippi Embayment |
| Coordinates | 30°25′N 96°24′W |
| Region | Gulf Coast and Mississippi Embayment |
| Country | United States and Mexico |
| Extent | Florida to Tamaulipas |
| Type section | |
| Named for | Wilcox County, Alabama |
| Location | not designated |
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