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National Geologic Map Database
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  • Usage in publication:
    • Coleville Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Thompson, R.R., 1963, Lithostratigraphy of the Middle Ordovician Salona and Coburn Formations in central Pennsylvania: Pennsylvania Geological Survey General Geology Report, 4th series, no. 38, 154 p.


Summary:

Named as a member of Coburn Formation. Derivation of name not given, but probably from Coleville. Is a calcirudite divided into three units based on fossil content. Lower 9-ft section contains interlayers of crinoidal bioskeletal calcirudite. Middle 25-ft section extends from 9 to 34 ft above base of formation and contains subequal percentages of SOWERBYELLA bioskeletal calcirudite. Upper 139.5-ft section is distinguished by interbeds of DALMANELLA bioskeletal calcirudite and DALMANELLA-crinoidal bioskeletal calcirudite. Overlies Milesburg Member; underlies Antes Shale. Age is Middle Ordovician.

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 ([ ]).