Usage:
Summerville Formation of San Rafael Group (AZ*,CO*,NM*,UT*)
Subunits:
/White Point Sandstone Member (UT).
Geologic age:
late Middle Jurassic (late Callovian)*
Type section, locality, area and/or origin of name:
Type section: at Summerville Point, near head of Summerville Wash, Emery Co., UT. Named from exposures on Summerville Point (Gilluly and Reeside, 1928).
AAPG geologic province:
Paradox basin*
Plateau sedimentary 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 ([ ]).