From Handwiki | Mount Simon Sandstone Stratigraphic range: Upper Cambrian ? PreЄ
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O
S
D
C
P
T
J
K
Pg
N
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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]
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Categories: [Sandstone formations of the United States]