Wanakah Formation of San Rafael Group (AZ*,CO*,NM*,UT*)
Wanakah Formation (NM)
(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*).
late Middle Jurassic (Callovian)*
Not designated. Named from exposures in Wanakah Mine, Ouray Co., CO (Burbank, 1930).
Black Mesa basin*
Las Vegas-Raton basin*
San Juan basin*
San Juan Mountains province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 ([ ]).