Usage:
Sewanee Peak Volcanics (CO*)
Geologic age:
Oligocene*
Type section, locality, area and/or origin of name:
Type area: exposures on Sewanee Peak, from which unit is named, between Billings basin and heads of Chalk Creek and Middle Fork, South Arkansas River, Chaffee Co., CO (Toulmin and Hammarstrom, 1990).
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 ([ ]).