Usage:
Sedgwick Peak Quartzite Member of Brigham Quartzite (ID*)
Sedgwick Peak Quartzite of Brigham Group (ID)
Geologic age:
Early Cambrian*
Type section, locality, area and/or origin of name:
Type area: along crest of Portneuf Range from Sedgwick Peak north-northwest for about 5 mi, Bannock Co., ID.
Type section: exposures on southwest side of Twin Knobs, in SW/4 NE/4 sec. 12, T. 10 S., R. 38 E., Bannock and Caribou Cos., ID. Named from Sedgwick Peak, Portneuf Range (Oriel and others, 1971).
AAPG geologic province:
Snake 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 ([ ]).