Mount Simon Sandstone
| Mount Simon Sandstone Stratigraphic range: Upper Cambrian ? |
|
|---|---|
| Type | Geological formation |
| Unit of | Potsdam Sandstone |
| Underlies | Eau Claire Formation |
| Overlies | Precambrian bedrock (unconformably) |
| Area | Illinois, Indiana, Wisconsin, Michigan, Ohio, and Kentucky |
| Thickness | up to 2,000 feet (610 m) |
| Lithology | |
| Primary | Coarse sandstones |
| Other | Occasional fine dark grey or maroon shales |
| Type section | |
| Named for | Mount Simon escarpment in Eau Claire County, Wisconsin |
| 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.
It is overlain by the Eau Claire Formation or Ordovician strata. It is presumed to be Upper Cambrian in age, though not verified. See infobox for more details.
The Mount Simon formation is the equivalent of the La Motte Sandstone formation in the St. Francois Mountains of Missouri.
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