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- Usage in publication:
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- Coleville Member
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Appalachian basin
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 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 ([ ]).