Mount Simon Sandstone

The Mount Simon Sandstone is the basal sandstone of the Potsdam Sandstone. It was deposited in a nearshore environment, unconformably overlying Precambrian basement.

Mount Simon Sandstone
Stratigraphic range:
TypeGeological formation
Unit ofPotsdam Sandstone
UnderliesEau Claire Formation and Rome Formation
OverliesHinckley Sandstone and Middle Run Formation
Thicknessup to 2,000 feet (610 m)
Lithology
PrimaryCoarse sandstones
OtherOccasional fine dark grey or maroon shales
Location
ExtentIllinois, Indiana, Kentucky, Michigan, Minnesota, Ohio, and Wisconsin,
Type section
Named forMount Simon escarpment in Eau Claire County, Wisconsin
Named byE. O. Ulrich
Thickness at type section235 feet

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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