Mount Simon Sandstone
Stratigraphic range: Upper Cambrian ?

PreЄ

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. ↑ 1.0 1.1 1.2 "Mount Simon Sandstone". Indiana Geological Survey. http://igs.indiana.edu/compendium/comp0i04.cfm.
2. ↑ 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.
3. ↑ 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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