Wills Creek Formation
|Wills Creek Formation
Stratigraphic range: Silurian
|Other||siltstone, limestone, dolostone|
|Extent||Pennsylvania, Maryland, Virginia, West Virginia|
|Named for||Wills Creek at Cumberland, Allegany County, Maryland|
|Named by||P. R. Uhler, 1905|
The Wills Creek is defined as a moderately well bedded greenish-gray shale containing local limestone and sandstone zones, or more specifically as an olive to yellowish-gray, thin-bedded sandstone, calcareous shale, dolostone, argillaceous limestone, and sandstone. Red shale and siltstone occur in the lower part of the formation. The formation has a thickness between 450 feet and 600 feet in Maryland and 445 to 620 feet in Pennsylvania.
Dean et al. (1985) describe the Wills Creek as sparsely fossiliferous.
- Type section at Wills Creek at Cumberland, Allegany County, Maryland
- Roundtop Hill, Maryland, along railroad grade
The Wills Creek is a poor source of construction material and is only suitable as common fill.
- Uhler, P.R., 1905, The Niagara period and its associates near Cumberland, Maryland: Maryland Academy of Science Transactions, v. 2, p. 19-26.
- "Table 1. Paleozoic Stratigraphic Section in Central Pennsylvania" (PDF). Geological Report On The Skytop Road Cuts. Pennsylvania State University Department of Geosciences. 2004.
- McElroy, Thomas A. (2004). Bedrock Geologic Map of the Lewistown Quadrangle, Mifflin and Juniata Counties, Pennsylvania (PFD) (Map). Pennsylvania Geological Survey.
- "Wills Creek Limestone Formation". The Paleobiology Database. Advisory Board of the Paleobiology Database. Retrieved 2008-01-26.
- Dean, S.L., Kulander, B.R., and Lessing, Peter, 1985, Geology of the Capon Springs, Mountain Falls, Wardensville, Woodstock, and Yellow Springs quadrangles, Hampshire and Hardy Counties, West Virginia: West Virginia Geological and Economic Survey Map, 26, 1 sheet, scale 1:24,000
- Harris, A.G., Stamm, N.R., Weary, D.J., Repetski, J.E., Stamm, R.G., and Parker, R.A., 1994, Conodont color alteration index (CAI) map and conodont-based age determinations for the Winchester 30' x 60' quadrangle and adjacent area, Virginia, West Virginia, and Maryland: U.S. Geological Survey Miscellaneous Field Studies Map, MF-2239, 40 p., 1 sheet, scale 1:100,000 
- "Allegheny Plateau and Valley and Ridge". Geologic Map of Maryland. Maryland Geological Survey. 1968. Retrieved 2008-01-26.
- Doden, Arnold G. and Gold, David P. (2008). "Bedrock Geologic Map of The Mc Alevys Fort Quadrangle, Huntingdon, Centre, and Mifflin Counties, Pennsylvania" (PDF). Pennsylvania Geological Survey.
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