Usage:
Horseshoe Mountain Porphyritic Leuco Quartz Monzonite of Horseshoe Basin Group (WA)
Geologic age:
Early Cretaceous
Type section, locality, area and/or origin of name:
Not stated. Origin of name not stated by author, but probably named from exposures in Horseshoe Mountain, along 49th parallel in Okanogan Range of northern WA (Hibbard, 1965).
AAPG geologic province:
Northern Cascade Range-Okanagan 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).