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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Chatham Hill formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • 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 for Chatham Hill in Chatham Hill quad, southwestern VA [Name attributed to B.N. Cooper and G.A. Cooper]. Occurs in area for which Porterfield stage is named. Base is not generally well exposed and is transitional with underlying black, graptolitic shales of Rich Valley formation (new). Upper part is cherty, dark-bluish-gray limestone with top prominently defined by succeeding ledges of calcarenite forming lower part of Wassum formation (new). Total thickness about 450 ft. Age is Middle Ordovician.

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


Map showing publication footprint
  • Usage in publication:
    • Chatham Hill Limestone*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

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 ([ ]).