Usage:
Aspen Member of Mancos Shale (UT,WY)
Aspen Shale (ID*,UT*,WY*)
Aspen Formation (ID*,WY*)
Geologic age:
late Early to early Late Cretaceous (Albian to Cenomanian)*
Type section, locality, area and/or origin of name:
Named from exposures near Old Aspen Station, a now abandoned alinement of the Union Pacific RR, in center of sec. 29, T. 14 N., R. 118 W., [approx. Lat. 41 deg. 09 min. 41 sec. N., Long. 110 deg. 45 min. 03 sec. W., along bdry. btw. Sulphur Creek Reservoir and Piedmont Reservoir 7.5-min quadrangles], Uinta Co., southwestern WY, about 20 mi northeast of southwest corner of the State (Veatch, 1907).
AAPG geologic province:
Green River basin*
Uinta Uplift*
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 ([ ]).