Usage:
Entrada Sandstone of San Rafael Group (AZ*,CO*,NM*,UT*)
Subunits:
(alphabetical): Cannonville Member (UT), Cow Springs Member (AZ*), Dewey Bridge Member (CO*,UT*), Escalante Member (UT), Exeter Member (NM), Gunsight Butte Member (UT), Iyanbito Member (NM*), Moab Member (CO*,UT*) or Moab Tongue (CO*,UT*), Red Mesa Member (AZ,NM,UT), Rehoboth Member (AZ*,CO*,NM*,UT*), Slick Rock Member (CO*,UT*).
Geologic age:
late Middle Jurassic (early to middle Callovian)*
Type section, locality, area and/or origin of name:
Type section: Entrada Point, northern San Rafael Swell, Emery Co., UT. Named from Entrada Point (Gilluly and Reeside, 1928).
Principal reference section measured at Pine Creek in SW/4 sec. 29 and SE/4 sec. 30, T. 24 S., R. 3 E., Garfield Co., UT (Peterson, 1988).
AAPG geologic province:
Anadarko basin*
Black Mesa basin*
Denver basin*
Great Basin province
Green River basin*
Las Vegas-Raton 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 ([ ]).