Usage:
Dark Canyon sequence (informal) in Wasatch Formation (CO*,UT*)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
early Tertiary (early Paleocene)*
Type section, locality, area and/or origin of name:
Type section: Sego Canyon, in secs. 3, 15, 28, and 33, T. 20 S., R. 20 E., Grand Co., UT (Francyzk and others, 1990).
AAPG geologic province:
Paradox basin*
Piceance 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 ([ ]).