Usage:
Nathrop Volcanics (CO*)
Geologic age:
early Tertiary (Oligocene)*
Type section, locality, area and/or origin of name:
Type locality: in secs. 11-13, T. 15 S., R. 78 W., Poncha Springs NE quadrangle, Chaffee Co., central CO. Named from community of Nathrop, Poncha Springs NE quadrangle, Chaffee Co., central CO (Van Alstine, 1969).
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 ([ ]).