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Usage:
/Bald Mountain Tonalite (OR)
[Preoccupied. Name previously applied to Bald Mountain Lake Beds Member of Esmeralda Formation by Ferguson (1924) in NV.]
Geologic age:
Early Cretaceous(?)
Type section, locality, area and/or origin of name:
Characteristically exposed on Mount Ireland (formerly called Bald Mountain), in sec. 29, T. 8 S., R. 36 E., Mt. Ireland 7.5-min quadrangle, Grant Co., OR. Named from Bald Mountain batholith, of which it is major rock component (Taubeneck, 1957).
AAPG geologic province:
Blue 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).