Usage:
St. Charles Formation (ID*,UT*)
St. Charles Limestone (ID*,UT*)
Subunits:
Worm Creek Quartzite Member (ID*,UT*).
Geologic age:
Late Cambrian (early Ibexian)*
Type section, locality, area and/or origin of name:
Type locality: west of town of St. Charles, Bear River Range, Bear Lake Co., southeastern ID (Walcott, 1908).
AAPG geologic province:
Great Basin 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 ([ ]).