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  • Usage in publication:
    • Principio Furnace Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Metavolcanics
    • Diamictite
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Higgins, M.W., 1977, Six new members of the James Run Formation, Cecil County, northeastern Maryland, IN Sohl, N.F., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1976: U.S. Geological Survey Bulletin, 1435-A, p. A122-A127.


Summary:

Principio Furnace Member named in this report as one of eight members of James Run Formation of Glenarm Group. Unit is composed of dark- to light-gray to white, interbedded, and multiply folded intermediate to felsic metavolcanic rocks with relict phenocrysts of plagioclase, quartz, and amphibole. Also contains some diamictites, composed partly of volcanic and partly of nonvolcanic material. Thickness 760 m. Gradationally underlies Frenchtown Member; probably partly equivalent to Little Northeast Creek Member. Age is early Paleozoic.

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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