Port Ewen Shale

(Clarke, 1903) - 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. Lower contact abrupt and placed at top of uppermost medium-gray, argillaceous limestone in Minisink Limestone. Thickness approximately 46 m (150 ft).
State New Jersey
Name Port Ewen Shale
Geologic age Lower Devonian
Lithologic constituents
Major
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)
References

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.

https://pubs.er.usgs.gov/publication/i2540A

Clarke, J.M., 1903, Classification of New York series of geological formations: New York State Museum Handbook 19, 28 p.

NGMDB product
Counties Sussex