- Usage in publication:
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- Carter Sandstone Member*
- Modifications:
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- Named
- Dominant lithology:
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- Sandstone
- AAPG geologic province:
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- North Park basin
Summary:
Named as a member of Pierre Shale for Carter Creek in the Kremmling quad, Grand Co, CO in North Park basin. Type locality is a few mi south of Carter Creek in NW1/4 NW1/4 sec 20 and SW1/4 SW1/4 sec 17, T3N, R80W. Is a very fine-grained, thick-bedded to massive, ridge-forming sandstone. Low-angle medium-scale cross-stratified beds common. Dark-brown-weathering calcareous sandstone concretions as much as 4 ft in diameter are in uppermost beds. Ranges from 30 to 65 ft thick. Lower contact chosen at place where sandstone predominates over silty shale; upper contact placed at top of a layer of ellipsoidal calcareous sandstone concretions. Lies in upper middle part of Pierre. Only fossil fragments found. Probably lies within the Range Zone of DIDYMOCERAS STEVENSONI of late Campanian or Late Cretaceous age.
Source: GNU records (USGS DDS-6; Denver 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 ([ ]).