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National Geologic Map Database

Geologic Unit: Cloverly

Usage:

Cloverly Formation (CO*,MT,UT*,WY*)
[?] Cloverly Group (MT,WY)


Subunits:

FORMATION STATUS (alphabetical): Fuson Shale Member (WY*), Greybull Sandstone Member (MT,WY*), Himes Member (MT,WY), Little Sheep Mudstone Member (MT,WY), Lovell Member (WY), Otter Creek Sandstone Member (WY), Pryor Conglomerate Member (WY*), Sykes Mountain Member (WY).
[?] GROUP STATUS (alphabetical) --all in MT: Dakota Siltstone, Fall River Formation, Fuson Formation or Fuson Shale, Greybull Formation, Lakota Formation. (formations belonging to Cloverly Group of WY not listed by GNU)


Geologic age:

Early Cretaceous (Neocomian to Aptian)*


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

Cloverly, Bighorn Co., WY. Cloverly is a post office on eastern side of Bighorn basin, WY (Darton, 1904).
Type locality stated to be near Cloverly, WY, about 15 mi northeast of Basin, Bighorn Co., WY (Lupton, 1916).


AAPG geologic province:

Powder River basin*
Bighorn 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 ([ ]).