| Mount Simon Sandstone | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Potsdam Sandstone |
| Underlies | Eau Claire Formation and Rome Formation |
| Overlies | Hinckley Sandstone and Middle Run Formation |
| Thickness | up to 2,000 feet (610 m) |
| Lithology | |
| Primary | Coarse sandstones |
| Other | Occasional fine dark grey or maroon shales |
| Location | |
| Extent | Illinois, Indiana, Kentucky, Michigan, Minnesota, Ohio, and Wisconsin, |
| Type section | |
| Named for | Mount Simon escarpment in Eau Claire County, Wisconsin[1] |
| Named by | E. O. Ulrich |
| Thickness at type section | 235 feet |
The Mount Simon Sandstone is the basal sandstone of the Potsdam Sandstone. It was deposited in a nearshore environment, unconformably overlying Precambrian basement.[2]
It is overlain by the Eau Claire Formation or Ordovician strata. It is presumed to be Upper Cambrian in age, though not verified.[3] See infobox for more details.[1]
The Mount Simon formation is the equivalent of the La Motte Sandstone formation in the St. Francois Mountains of Missouri.[1]
References
- 1 2 3 "Mount Simon Sandstone". Indiana Geological Survey. Retrieved 2014-08-26.
- ↑ Hamblin, A. P. (2011). Detailed outcrop and core measured sections of Upper Cambrian and Middle Ordovician sandstones (and associated facies), southwestern Ontario (Report). Geological Survey of Canada. doi:10.4095/288671. Open File 6856.
- ↑ Hamblin, A. P. (October 1998). Upper Cambrian strata of southwestern Ontario: Summary of literature (Report). Geological Survey of Canada. Open File 3663.
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