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National Geologic Map Database

Geologic Unit: Dinwoody

Usage:

Dinwoody Formation (ID*,MT*,UT*,WY*)


Subunits:

(alphabetical): Freezout Shale Member (WY), Little Medicine Member (WY).


Geologic age:

Permian
Triassic, Early*


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

Not designated. Origin of name not stated by author, but probably named from exposures at Dinwoody Canyon, western Fremont Co., in the Wind River Mountains, WY (Blackwelder, 1918).


AAPG geologic province:

Montana folded belt*
Yellowstone province*
Bighorn basin*
Green River basin*
Wind River basin*
Wasatch uplift*


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 ([ ]).