Usage:
Skull Creek Shale (MT*,ND*,SD*,WY*)
Skull Creek Shale of Dakota Group (CO,NE)
Skull Creek Formation of Dakota Group (ND)
Skull Creek Member of Graneros Shale (SD)
Skull Creek Member of Colorado Shale (MT*)
Subunits:
Newcastle Sandstone Member (SD,WY).
Geologic age:
late Early Cretaceous (Albian)*
Type section, locality, area and/or origin of name:
Not designated. Named from exposures along Skull Creek, southeast of Osage, Weston Co., WY (Collier, 1922).
Reference section (measured by Mapel, 1959): near Buffalo, in sec. 25, T. 49 N., R. 83 W., Johnson Co., WY (Roberts, 1972).
AAPG geologic province:
Denver basin*
Powder River basin*
Williston 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 ([ ]).