|Name||Port Ewen Shale|
|Geologic age||Lower Devonian|
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)Upper part is medium-gray- weathering, dark-to-medium-dark-gray, thin- to medium-bedded, fossiliferous, calcareous siltstone and shale. Lower part is medium-dark-gray, irregularly bedded nonfossiliferous, calcareous silty shale.
Sedimentary > Clastic > Siltstone (Bed, Calcareous)Upper part is medium-gray- weathering, dark-to-medium-dark-gray, thin- to medium-bedded, fossiliferous, calcareous siltstone.
|Comments||Helderberg Group (Lower Devonian and Upper Silurian)|
Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1), scale 1:100,000.
Drake, Avery A. Jr.,Volkert, Richard, A., Monteverde, Donald H., Herman, Gregory C., Houghton,Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock Geologic Map of Northern New Jersey: U.S. Geological Survey Miscellanenous Investigations Map I-2540-A, 4 cross sections, 2 sheets, size 56x40; 58x41, scale 1:100.000.
Clarke, J.M., 1903, Classification of New York series of geological formations: New York State Museum Handbook 19, 28 p.