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  • Usage in publication:
    • Bradford Group
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Appalachian basin
Publication:

Hopkins, E.M., 1992, Paleogeomorphic and sedimentologic framework of Bradford and Venango Group shorelines in northern Pennsylvania, IN Sevon, W.D., ed., Geology of the upper Allegheny River region in Warren County, northwestern Pennsylvania; Guidebook for the 57th annual field conference of Pennsylvania geologists: Field Conference of Pennsylvania Geologists, Bradford, PA, October 1-3, 1992, no. 57, p. 21-46.


Summary:

Bradford Group. Informal drillers' term for Upper Devonian sands in subsurface of northwestern Pennsyvlania. Includes seven sand zones (ascending): (1) lower Kane; (2) Lewis Run; (3) Bradford Third / Richburg / Rushford / Alfred Station Coquinite; (4) Bradford Second / Cooper(?) / Scholes; (5) Clarendon / Chipmunk; (6) Queen / Glade / Bradford First /Cuba; and (7) Warren Second. Approximately equivalent to Canadaway Formation of New York. Underlies "Pink Rock" (C-shale zone) and overlies Venango Group. [Despite capitalization of rank term, author makes it clear that terminology is informal.]

Source: Modified from GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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