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Geologic Unit: Carroll
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  • Usage in publication:
    • Carroll Gneiss Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Crowley, W.P., 1976, The geology of the crystalline rocks near Baltimore and its bearing on the evolution of the eastern Maryland Piedmont: Maryland Geological Survey Report of Investigations, no. 27, 40 p.


Summary:

Named as a member of James Run Formation. Named for Carroll Park, Baltimore, MD. Consists of fine- to medium-grained biotite-quartz-plagioclase gneiss. Overlies(?) or is in thrust contact with Hollofield Layered Ultramafite (Baltimore Mafic Complex) in east-west anticline; interfingers with Druid Hill Amphibolite Gneiss Member of James Run Formation or Jones Falls Schist in northeast-southwest syncline. Age is Cambrian(?).

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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