Purcell Basalt of Missoula Group of Belt Supergroup (MT*)
Purcell Lava [Member] of Snowslip Formation of Missoula Group of Belt Supergroup (MT*)
Not designated. Named from exposures in the McGillivray, Galton, Clarke and Lewis Ranges of the Purcell Mountain system, British Columbia, Canada (Daly, 1912).
Northern Rocky Mountain region*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 ([ ]).