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National Geologic Map Database

Geologic Unit: Prichard

Usage:

Prichard Formation of Belt Supergroup (ID*,MT*,WA*)


Geologic age:

Middle Proterozoic*


Type section, locality, area and/or origin of name:

Named from Prichard Creek, which drains a large part of the most extensive area occupied by this formation within the Coeur d'Alene district, [Shoshone Co.], northeast ID (Calkins, 1908).


AAPG geologic province:

Northern Rocky Mountain region*


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 ([ ]).