Usage:
Denver Basin Group (CO)
Subunits:
(alphabetical) --all in CO: Arapahoe conglomerate (informal, unranked), Black Squirrel Formation, Dawson Arkose, Denver Formation, Jimmy Camp Formation, Pikeview Formation, Pulpit Rock Formation.
Geologic age:
Late Cretaceous and early Tertiary (Maastrichtian, Paleocene, and Eocene)
Type section, locality, area and/or origin of name:
[Recognized in area east of the Rocky Mountains, eastern CO, from Greeley, Weld Co., southward to Colorado Springs, El Paso Co., and as far east as Limon, Lincoln Co. Probably named from Denver basin (Denver-Julesburg basin), an asymmetrical bowl-shaped geologic structural basin in the Interior Plains (Colorado Piedmont) physiographic province.]
AAPG geologic province:
Denver 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 ([ ]).