Usage:
Prichard Formation of Belt Supergroup (ID*,MT*,WA*)
Geologic age:
Mesoproterozoic*
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).