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National Geologic Map Database

Geologic Unit: Aspen

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).