Oriskany Group, undivided

(Willard, 1938) - Thickness ranges from 38 m (125 ft) in southwest to 52 m (170 ft) in northeast. Ridgely Sandstone (Swartz and others, 1913) - White-weathering, medium-gray, medium- to thick-bedded, carbonate-cemented quartz-pebble conglomerate and coarse quartz sandstone, which contain abundant brachiopods. Moderately well sorted, subrounded sand gains. Unit thins northeastward and pinches out at Peters Valley. Lower contact abrupt. Thickness ranges from 0 to 10 m (0-32 ft). Shriver Chert (Swartz and others, 1913) - Medium- to dark-gray-weathering, black to dark-gray, medium-to-thick-bedded siltstone and shale containing interbedded black chert and local chert-bearing limestone. Present only in southwestern part of outcrop area where lower contact is gradational with silty limestone of Glenarie Formation. Thickness ranges from 0 to 9 m (0-30 ft). Glenarie Formation (Chadwick, 1908) - Medium-gray-weathering, medium- to dark-gray, fine-grained, thin- to medium-bedded, fossiliferous, silty limestone, and local chert lenses. Unit thickens to northeast. Lower contact probably gradational. Thickness ranges from 17 to 52 m (55-170 ft).
State New Jersey
Name Oriskany Group, undivided
Geologic age Lower Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed, Lens)Shriver Chert - medium- to dark-gray-weathering, black to dark-gray, medium-to-thick-bedded siltstone.
Sedimentary > Clastic > Conglomerate (Lens)Ridgely Sandstone - White-weathering, medium-gray, medium- to thick-bedded, carbonate-cemented quartz-pebble conglomerate.
Sedimentary > Clastic > Sandstone (Lens)Ridgely Sandstone - coarse quartz sandstone, which contain abundant brachiopods; moderately well sorted, sub-rounded sand gains.
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Lens)Shriver Chert
Sedimentary > Carbonate > Limestone (Lens)Shriver Chert - local chert-bearing limestone. Glenarie Formation - medium-gray-weathering, medium- to dark-gray, fine-grained, thin- to medium-bedded, fossiliferous, silty limestone.
Incidental
Sedimentary > Chemical > Chert (Lens)Shriver Chert - interbedded black chert and local chert-bearing limestone. Glenarie Formation - local chert lenses.
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

Willard, Bradford, 1938, A Paleozoic section at Delaware Water Gap: Pennsylvania Geological Survey, 4th series, Bulletin G-11, 35 p.

Chadwick, G.H., 1908, Revision of "the New York series": Science, new series, v.28, p. 346-348.

NGMDB product
Counties Sussex