Usage:
Sheep Creek Formation of Ogallala Group (NE, and WY-local)
Subunits:
(alphabetical) --all in NE: /Sheep Creek ash [informal, unranked], Spottedtail Member.
Geologic age:
late Tertiary (Miocene; Hemingfordian NALMA)
Type section, locality, area and/or origin of name:
Named from Sheep Creek, Sioux Co., northwestern NE (Matthew and Cook, 1909).
[Principal reference section]: measured in "APHELOPS Draw," in E/2 E/2 sec. 30, T. 26 N., R. 55 W., Sioux Co., northwestern NE (Skinner and others, 1977).
AAPG geologic province:
Denver basin
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 ([ ]).