Usage:
Thorn Creek Beds of Idaho Group (ID-recognized locally near Idaho City)
Geologic age:
Miocene, middle
Type section, locality, area and/or origin of name:
Notable exposures about 10 mi south of Idaho City, [approx. Lat. 43 deg. 44 min. 15 sec. N., Long. 115 deg. 51 min. 45 sec. W., Boise Co., Boise National Forest], southern ID, in lower drainage of Thorn Creek. Formation exposed as asymmetrical syncline, with east flank dipping 60 deg. W., and west flank dipping 5 to 7 deg. E. West limb truncated by high-angle normal fault that trends northerly (Axelrod, 1964).
AAPG geologic province:
Great Basin 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 ([ ]).