Usage:
San Rafael Group (AZ*,CO*,NM*,UT*)
Subunits:
(alphabetical): Bell Ranch Formation (NM*), Bluff Sandstone (AZ,NM), Carmel Formation (AZ*,CO*,NM*,UT*,WY*), Cow Springs Sandstone (AZ), Curtis Formation (CO*,UT*), Entrada Sandstone (AZ*,CO*,NM*,UT*), Henrieville Sandstone (UT), Page Sandstone (AZ*,UT*,WY*), Romana Sandstone (AZ*,UT*), Summerville Formation (AZ,CO,NM,UT), Temple Cap Formation (UT) or Temple Cap Sandstone (UT*), Thoreau Formation (NM), Todilto Formation (AZ,CO,NM,UT) or Todilto Limestone (AZ,CO*,UT*), Wanakah Formation (AZ*,CO*,NM*,UT*).
Geologic age:
Middle Jurassic (Bajocian to Callovian)*
Type section, locality, area and/or origin of name:
Not designated. Named from exposures in the San Rafael Swell, Emery Co., UT (Gilluly and Reeside, 1928).
AAPG geologic province:
Black Mesa basin*
Great Basin province*
Palo Duro basin*
Paradox basin*
Piceance basin*
Plateau sedimentary province*
San Juan basin*
Sierra Grande 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).