Usage:
Dry Union Formation (CO*)
Geologic age:
late Tertiary (Miocene or possibly early Pliocene)*
Type section, locality, area and/or origin of name:
[Type locality not designated.] Named from Dry Union Gulch, mouth of which in sec. 23, T. 10 S., R. 80 W., 5 mi south of Leadville, [Mount Elbert 15-min quadrangle], Lake Co., central CO (Tweto, 1961).
AAPG geologic province:
Eagle 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 ([ ]).