Usage:
Belden Formation (CO*)
Belden Shale (CO*)
Subunits:
Newett Limestone [Bed] (CO).
Geologic age:
Early and Middle Pennsylvanian (Morrowan and Atokan)*
Type section, locality, area and/or origin of name:
Type section: north side of Rock Creek Valley along U.S. Highway 24 (1938) 0.2 mi north of Gilman, Eagle Co., northwestern CO. Named from station of Belden on Denver and Rio Grande Western RR (Brill, 1942).
AAPG geologic province:
Eagle basin*
Green River basin
Las Vegas-Raton basin*
Piceance 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 ([ ]).