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  • Usage in publication:
    • Stumptown Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Gravel
    • Clay
    • Sand
  • AAPG geologic province:
    • Atlantic Coast basin
Publication:

Mixon, R.B., 1985, Stratigraphic and geomorphic framework of uppermost Cenozoic deposits in the southern Delmarva Peninsula, Virginia and Maryland, IN Surface and shallow subsurface geologic studies in the emerged coastal plain of the middle Atlantic states: U.S. Geological Survey Professional Paper, 1067-G, p. G1-G53, (incl. geologic maps, scale 1:125,000 and 1:400,000)


Summary:

The lower sandy gravel, clay-silt, and fine sand sequence of the Nassawadox Formation is here named the Stumptown Member. It is entirely subsurface and contains three distinct lithofacies, units A, B, and C. Unconformably overlies the Eastover and Yorktown Formations; conformably to disconformably underlies the Butlers Bluff Member of the Nassawadox. Thickness at type section is 140 ft (43 m). Age is Pleistocene.

Source: 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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