Usage:
Left Fork coal beds (informal) of Raton Formation (NM*)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Tertiary*
Paleocene*
Type section, locality, area and/or origin of name:
Not designated. Exposed on the steeply dipping east flank of Vermejo Park anticline in Left Fork of York Canyon and in Canadian River Canyon, Raton coal field, Colfax Co., NM. Origin of name not stated by author, but probably named from Left Fork (Pillmore, 1976).
AAPG geologic province:
Las Vegas-Raton 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 ([ ]).