Mount Simon Sandstone Stratigraphic range: Upper Cambrian ? | |
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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]
Original source: https://en.wikipedia.org/wiki/Mount Simon Sandstone.
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