| Shawangunk Formation | |
|---|---|
Stratigraphic range: | |
 Exposure of the Shawangunk at Lehigh Gap in Pennsylvania | |
| Type | Geological formation |
| Underlies | Bloomsburg Formation |
| Overlies | Martinsburg Formation |
| Thickness | approx. 1400 ft[1] |
| Lithology | |
| Primary | quartzarenite (sandstone), conglomerate |
| Location | |
| Region | Appalachian Mountains |
| Extent | Pennsylvania, New Jersey, New York |
| Type section | |
| Named for | Shawangunk Ridge |
| Named by | W. W. Mather, 1840[2] |
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.
- ^ Epstein, J.B., and Epstein, A.G., 1972, The Shawangunk Formation (Upper Ordovician (?) to Middle Silurian) in eastern Pennsylvania: U.S. Geological Survey Professional Paper 744, 45 p. [1]
- ^ Mather, W.W., 1840, Fourth annual report of the first geological district of the State of New York: New York Geological Survey Annual Report, no. 4, p. 209-258.