Pennsylvania
Lyman (1895) Penn | Bascom et al (1909) Penn | Lyttle & Epstein (1987) Penn | Weems & Olsen (1997) Penn/NJ/NY | |||
Early Jurassic | Pottstown Shales | Brunswick Shale | Brunswick Group | Upper part | Meriden Group | Feltville Formation |
Jacksonwald Basalt | Orange Mountain Basalt | |||||
Lower part | Chatham Group | Passaic Formation | ||||
Late Triassic | ||||||
Perkasie Shales | ||||||
Lansdale Shales | ||||||
Gwynedd Shales | Lockatong Formation | Lockatong Formation | Lockatong Formation | |||
Norristown Shales | Stockton Formation | Stockton Formation | Stockton Formation |
New York - New Jersey
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Hook Mountain Basalt
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Orange Mountain Basalt
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Passaic Formation | Passaic Formation | Chatham Group |
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Lockatong Formation | Lockatong Formation |
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Stockton Formation | Stockton Formation |
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Note: The Triassic-Jurassic boundary lies within the uppermost part of the Passaic Formation.
Modified from:
Luttrell, G.W. 1989. Stratigraphic Nomenclature of the Newark Supergroup of Eastern North America. U.S. Geological Survey Bulletin 1572.
Weems, R.E. and Olsen, P.E. 1997. Synthesis and
revision of groups within the Newark Supergroup, eastern North America.
GSA Bulletin, v. 109, no. 2, p. 195-209.
Additional References:
Bascom, F., Clark, W.B., Darton, N.H., Kummel, H.B., and others. 1909. Philadelphia folio, Pennsylvania, New Jersey, Delaware. U.S. Geological Survey Geologic Atlas of the United States, no. 162, 10 maps, 23 p.
Bayley, W.S., Salisbury, R.D., and Kummel, H.B. 1914. Raritan folio, New Jersey. U.S. Geological Survey Geologic Atlas of the United States, no. 191, 5 maps, 32 p.
Darton, N.H., Bayley, W.S., Salisbury, R.D. and Kummel, H.B. 1908. Passaic folio, New Jersey-New York. U.S. Geological Survey Geologic Atlas of the United States, no. 157, 4 maps, 27 p.
Kummel , H.B. 1897. The Newark System - Report of progress. New Jersey Geological Survey Annual Report of the State Geologist for the year 1896, pp. 25-88.
Lyman, B.S. 1895. New Red of Bucks and Montgomery Counties. In A summary description of the geology of Pennsylvania. Pennsylvania Geological Survey v.3, pt. 2, pp. 2589-2638.
Lyttle, P.T. and Epstein, J.B. 1987. Geologic map of the Newark 1 by 2 quadrangle, New Jersey, Pennsylvania, and New York. U.S. Geological Survey Miscellaneous Investigations Map I-1715, scale 1:250,000.
Olsen, P.E. 1980. The latest Triassic and Early Jurassic formations
of the Newark basin (eastern North America, Newark Supergroup): stratigraphy,
structure and correlation. New Jersey Academy of Science Bulletin, v. 25,
pp. 25-51.