Usage:
Wanakah Formation of San Rafael Group (AZ*,CO*,NM*,UT*)
Wanakah Formation (NM)
Subunits:
(alphabetical): Beclabito Member (AZ*,NM*,UT*), Bilk Creek Sandstone Member (CO*), Horse Mesa Member (AZ*,NM*,UT*), Junction Creek Sandstone Member (CO*), Pony Express Limestone Member (CO*), Todilto Limestone Member (AZ*,NM*).
Geologic age:
late Middle Jurassic (Callovian)*
Type section, locality, area and/or origin of name:
Named from exposures in Wanakah Mine, Ouray district, [Ouray Co.], southwestern CO (Burbank, 1930).
AAPG geologic province:
Black Mesa basin*
Las Vegas-Raton basin*
Paradox basin*
Piceance basin*
San Juan basin*
San Juan Mountains province*
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 ([ ]).