Usage:
Mount Aetna Quartz Monzonite Porphry (CO*)
Originally called Etna.
Geologic age:
Tertiary*
Oligocene*
Type section, locality, area and/or origin of name:
Mount Aetna, 3 mi north of Monarch, Chaffee Co., CO. Named from Mount Aetna (Etna) (Crawford, 1913; Dings and Robinson, 1957).
AAPG geologic province:
Eagle basin*
Piceance 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 ([ ]).