Cornwall Shale

(Hartnagel, 1907) - Black to dark-gray, very-thin- to thickbedded, fissile shale, fossiliferous, interbedded with medium-gray and light-olive-gray to yellowish-gray, laminated to very-thin-bedded siltstone, that increases in upper part of unit. Lower contact probably conformable. About 290 m (950 ft) thick.
State New Jersey
Name Cornwall Shale
Geologic age Middle Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)Black to dark-gray, very-thin- to thickbedded, fissile shale, fossiliferous.
Sedimentary > Clastic > Siltstone (Bed)interbedded with medium-gray and light-olive-gray to yellowish-gray, laminated to very-thin-bedded siltstone
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

Hartnagel, C.A., 1907, Upper Siluric and Lower Devonic Formations of the Skunnemunk Mountain region: New York State Museum Bulletin 107, p. 39-54

NGMDB product
Counties Morris - Passaic