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  • Usage in publication:
    • Switzer Creek Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Graywacke
    • Conglomerate
  • AAPG geologic province:
    • Appalachian basin
Publication:

Lash, G.G., and Drake, A.A., Jr., 1984, The Richmond and Greenwich slices of the Hamburg klippe in eastern Pennsylvania; stratigraphy, sedimentology, structure, and plate tectonic implications: U.S. Geological Survey Professional Paper, 1312, 40 p.


Summary:

Interbedded shale and calcareous graywacke with local conglomerate beds that contain shale and limestone clasts are here named the Switzer Creek Member of the Windsor Township Formation in the Greenwich slice of the Hamburg klippe in PA. Graywacke is thick-bedded to massive and highly porous, resulting from weathering of limestone clasts and calcite cement. Minimum thickness is 815 m. Age is Middle Ordovician based on graptolites.

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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