Usage:
Lake Fork Formation (CO*)
Geologic age:
Tertiary*
Oligocene*
Type section, locality, area and/or origin of name:
Named from exposures in Lake Fork of Gunnison River, Uncompahgre quadrangle. Exposures are confined to area, about 20 mi across, in central part of quadrangle (Cross and Larsen, 1923).
AAPG geologic province:
Piceance basin*
San Juan Mountains province*
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 ([ ]).