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National Geologic Map Database

Geologic Unit: St. Charles

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).