Usage:
Baldhills Tuff Member of Isom Formation (NV*,UT*)
Geologic age:
early Tertiary (Oligocene)*
Type section, locality, area and/or origin of name:
Named from occurrence in Baldhills ridge, which trends northward from type locality of Isom Formation, Three Peaks 7.5-min quadrangle, Iron Springs district, [Iron Co.], southwestern UT (Mackin, 1960).
AAPG geologic province:
Great Basin 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 ([ ]).