Usage:
Sacramento Porphyry (CO*)
Geologic age:
early Tertiary (Eocene)*
Type section, locality, area and/or origin of name:
Named from occurrence under Gemini Peaks, between heads of Big and Little Sacramento Gulches, vicinity of Leadville, Lake Co., central CO (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
Eagle 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 ([ ]).