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National Geologic Map Database
Geologic Unit: Dryden
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Map showing publication footprint
  • Usage in publication:
    • Dryden formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Shale
  • AAPG geologic province:
    • Appalachian basin
Publication:

Cooper, G.A., 1956, Chazyan and related brachiopods [U.S.-Canada]: Smithsonian Miscellaneous Collections, v. 127, pt. 1, 1245 p.


Summary:

Named the Dryden formation for Dryden, Lee Co., VA. Name is used for combined Benbolt and Wardell formations when these two units are not separated by the Gratton formation. Consists mostly of limestone, but may contain conspicuous amounts of shale as at Rye Cove and Lone Mountain. Thickness is 300 to 500 feet. Unit overlies the Surgener formation in TN and the Peery-Ward Cove sequence in VA, and underlies the Witten formation. The Dryden is of Middle Ordovician age.

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


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).