| Raccoon Creek Group | |
|---|---|
| Stratigraphic range: Carboniferous | |
| Type | Group |
| Sub-units | |
| Location | |
| Region |  Indiana |
| Country |  United States |
The Raccoon Creek Group is a geologic group in Indiana. It preserves fossils dating back to the Carboniferous period.
Stratigraphy
Brazil Formation
The Brazil Formation is a geologic formation in Indiana consisting of shale, sandstone, clay, and coal. It preserves fossils dating back to the Carboniferous period
Description
The Brazil Formation was named in 1902 for the city of Brazil, located in Clay County, Indiana. It originally included rocks between the bottom of the Petersburg Coal and the top of the Mansfield Sandstone. In 1922, a new survey resulted in restrictions to include only rocks between the Lower Block Coal Member and what was at the time called Coal II. In 1976, it was amended again to include rocks between the upper part of Minshall Coal Member and the lower part of Lower Block Coal Member.
The formation is made up of shale, sandstone, clay, and coal. Thickness is measured between 40 and 90 feet.[1]
Caseyville Formation
The Caseyville Formation is a geologic formation in Kentucky. It preserves fossils dating back to the Carboniferous period.
Mansfield Formation
The Mansfield Formation is a geologic formation in Indiana. It preserves fossils dating back to the Carboniferous period.
Tradewater Formation
The Tradewater Formation is a geologic formation in Kentucky. It preserves fossils dating back to the Carboniferous period .
Staunton Formation
The Staunton Formation is a geologic formation in Indiana [2] consisting of sandstone, shale, and coalbeds.[3][4]
Description
The formation was named by E. R. Cumings to refer to the exposed rocks found near Staunton, Clay County. Later surveys resulted in the inclusion of the Perth Limestone Member into the Staunton Formation, having previously belonged to the Brazil Formation.
The Staunton Formation is made up of sandstone and shale (75 to 150 feet), and coalbeds (up to 8).[3]
References
- ↑ Hutchison, Harold C. "Brazil Formation". Indiana Geological and Water Survey. University of Indiana Bloomington. Retrieved 11 October 2021.
- ↑ Generalized Stratigraphic Column of Indiana Bedrock
- 1 2 "Indiana Geological & Water Survey". Indiana University Bloomington. Retrieved 8 October 2021.
- ↑ Keroher, Grace C. (1966). Lexicon of Geologic Names of the United States for 1936-1960. .S. Government Printing Office.