Usage:
Boundary Ridge Member of Twin Creek Limestone (ID*UT*,WY*)
Geologic age:
Jurassic, Middle*
Bathonian, early*
Type section, locality, area and/or origin of name:
Type section: in RR cut about 1 mi southwest of Pegram and west of Boundary Ridge, in NW/4 sec. 12, T. 15 S., R. 45 E., Bear Lake Co., ID. Named from Boundary Ridge (Imlay, 1967).
AAPG geologic province:
Uinta uplift*
Uinta basin*
Snake River basin*
Yellowstone province*
Green River basin*
Wasatch 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 ([ ]).