Usage:
No current usage?
(†Tomichi Limestone (CO) considered abandoned? Uncertain if used by the CO Geol. Survey. Not used by the USGS.)
Geologic age:
Ordovician
Type section, locality, area and/or origin of name:
Not designated. Named from Tomichi district, in T. 49 and 50 N., R. 5 E., Gunnison Co., CO (Crawford, 1913).
AAPG geologic province:
Piceance basin
San Luis 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 ([ ]).