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Shawangunk Formation
The Silurian Shawangunk Formation is a mapped bedrock unit in eastern Pennsylvania, New Jersey, and New York. It is named for the Shawangunk Ridge for which it is the dominant rock type. The division of the Shawangunk between the Tuscarora Formation and Clinton Group has not been conclusively determined. The shift of nomenclature currently has the divide between Hawk Mountain and Lehigh Gap.
==Description==
The Shawangunk is defined as a light to dark-gray, fine to very coarsed grained sandstone and conglomerate, containing a few shale interbeds.〔Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.〕 There are also four members of this formation: Tammany, Lizard Creek, Minsi, and Weiders.
The Lizard Creek member is described at Lehigh Gap as having conglomerates, sandstone, calcareous sandstone, siltstone, and shale with a few minor red beds. The Minsi Member is described as a congloeritic quartzite and the Weiders is described as both a conglomerate and quartzite.〔Epstein, J.B., Sevon, W.D., Glaeser, J.D. (1974). Geology and the Mineral Resources of the Lehighton and Palmerton Quardrangles, Carbon and Northampton Counties, Pennsylvania. The Pennsylvania Geologic Survey, Harrisburg, PA. A195c&d.〕 The Tammany and Lizard Creek members are equivalent to the Clinton Formation and the Minsi and Weiders members are equivalent to the Tuscarora Formation in the central and western part of Pennsylvania. The Tammany Member was not described at Lehigh Gap.〔
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