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National Geologic Map Database

Geologic Unit: San Rafael

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 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 ([ ]).