Usage:
Irving Formation (CO*)
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by authors, but probably named from Irving Peak in southwest part of Needle Mountains quadrangle, La Plata Co., CO (Cross and Howe, 1905).
AAPG geologic province:
Southern Rocky Mountain region*
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 ([ ]).