Usage:
Ben Day Porphyry (TX)
Geologic age:
early Cenozoic
Type section, locality, area and/or origin of name:
Type locality not stated. Occurs as sheets, dikes, and necks in Mitre Peak area, which lies across Brewster-Jeff Davis Co. line, roughly 12 mi northwest of Alpine, west-central TX (Ives, 1941).
AAPG geologic province:
Permian basin
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 ([ ]).