| Freda Sandstone | |
|---|---|
| Stratigraphic range: Proterozoic | |
| Type | Formation |
| Underlies | Jacobsville Sandstone |
| Overlies | Nonesuch Shale |
| Lithology | |
| Primary | sandstone |
| Other | mudstone, shale |
| Location | |
| Region | Michigan and Wisconsin |
| Country |  United States |
Freda Sandstone (Pcf, grey) on NPS Apostle Islands geological map
The Freda Sandstone is a geologic formation in Michigan. It dates back to the Proterozoic. Lithologically, the Freda Sandstone is a lithic, red-brown, cyclic sequence of sandstones, mudstones and shales (conglomerates are rare).
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
- Catacosinos, Paul (1991). "Early Sedimentary Evolution of the Michigan Basin". Geological Society of America Special Paper. 256 (1): 248. ISBN 978-0-8137-2256-6.
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