Wills Creek Formation: Difference between revisions
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==Economic Uses== |
==Economic Uses== |
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The Wills Creek is a poor source construction material and is only suitable as common fill.<ref name=mcalevysfort>{{cite paper|url=http://www.dcnr.state.pa.us/topogeo/openfile/mcalevysfort.pdf|format=pdf|author= Doden, Arnold G. and Gold, David P.|year=2008|title=Bedrock Geologic Map of The Mc Alevys Fort Quadrangle, Huntingdon, Centre, and Mifflin Counties, Pennsylvania|publisher=Pennsylvania Geological Survey}}</ref> |
The Wills Creek is a poor source of construction material and is only suitable as common fill.<ref name=mcalevysfort>{{cite paper|url=http://www.dcnr.state.pa.us/topogeo/openfile/mcalevysfort.pdf|format=pdf|author= Doden, Arnold G. and Gold, David P.|year=2008|title=Bedrock Geologic Map of The Mc Alevys Fort Quadrangle, Huntingdon, Centre, and Mifflin Counties, Pennsylvania|publisher=Pennsylvania Geological Survey}}</ref> |
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==References== |
==References== |
Revision as of 22:24, 26 January 2008
The Silurian Wills Creek Formation (Swc) is a mapped bedrock unit in Pennsylvania, Maryland and West Virginia. It forms the bedrock of the valley around and to the east of Lewistown, Pennsylvania.[1]
Description
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.[2]
Fossils
The Wills Creek Limestone contain fossils from the Pridoli to the Ludlow epoch, or 422.9 to 418.1 Ma.[3]
Age
Relative age dating of the Wills Creek places it in the Silurian period. It rests conformably a top the Bloomsburg Formation and below the Tonoloway Formation.[4]
Economic Uses
The Wills Creek is a poor source of construction material and is only suitable as common fill.[5]
References
- ^ McElroy, Thomas A. (2004). Bedrock Geologic Map of the Lewistown Quadrangle, Mifflin and Juniata Counties, Pennsylvania (pfd) (Map). Pennsylvania Geological Survey.
- ^ "Table 1. Paleozoic Stratigraphic Section in Central Pennsylvania" (PDF). Geological Report On The Skytop Road Cuts. Pennsylvania State University Department of Geosciences. 2004.
- ^ "Wills Creek Limestone Formation". Advisory Board of the Paleobiology Database. Retrieved 2008-01-26.
- ^ "Allegheny Plateau and Valley and Ridge". 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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See also