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National Geologic Map Database

Geologic Unit: Phi Kappa

Usage:

Phi Kappa Formation (ID*)


Subunits:

Basin Gulch Quartzite Member (ID*).


Geologic age:

Ordovician to Early Silurian*


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

Not designated. Named from exposures on Phi Kappa Creek, in T. 6 N., R. 19 E., Custer Co., ID (Westgate and Ross, 1930).
Phi Kappa Creek shown as the type locality (Ross, 1934).


AAPG geologic province:

Snake River basin*
Idaho Mountains province*


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 ([ ]).