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National Geologic Map Database

Geologic Unit: Cody

Usage:

Cody Shale (ID?,MT*,WY*)
Cody Formation (WY*)


Subunits:

(alphabetical): Ardmore Bentonite Beds (WY*), Belle Fourche Member (MT*,WY*), Carlile Member (MT*,WY*), Claggett Member (MT*,WY*), Eldridge Creek Member (MT*), /Gammon Ferruginous Member (MT*,WY*), /Greenhorn Calcareous Member (MT*), Niobrara Member (MT*,WY*), Sage Breaks Member (WY*), Shannon Sandstone Member (MT,WY*), Steele Member (WY*), Sussex Sandstone Member (WY*), Telegraph Creek Member (MT*,WY), Wallace Creek Tongue (WY*).


Geologic age:

Late Cretaceous (Cenomanian to Campanian)*


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

Type locality: exposures at town of Cody near Shoshone River, Park Co., WY [Lat. 44 deg. 31 min. 35 sec. N., Long 109 deg. 03 min. 24 sec. W., Cody 7.5-min quadrangle] (Lupton, 1916).


AAPG geologic province:

Montana folded belt*
Central Montana uplift*
Bighorn basin*
Powder River basin*
Wind River basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).