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National Geologic Map Database

Geologic Unit: South Platte

Usage:

South Platte Formation of Dakota Group (CO*,WY*)


Subunits:

(alphabetical): Kassler Sandstone Member (CO*), Plainview Sandstone Member (CO*,WY*), Van Bibber Shale Member (CO*).


Geologic age:

Early Cretaceous*


Type section, locality, area and/or origin of name:

[Type section (composite)]: 0.5 mi north of Kassler, in NE/4 NW/4 SE/4 sec. 27, T. 6 S., R. 69 W., Jefferson Co., CO. Standard section measured in SW/4 NW/4 sec. 2, T. 3 N., R. 70 W. Standard marine section measured in W/2 NE/4 sec. 9, T. 10 N., R. 69 W., Larimer Co., CO. Named from South Platte River, Jefferson and Douglas Cos., CO (Waage, 1955).


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).