Geologic Unit: Snowy Range

Usage:

Snowy Range Formation of Gallatin Group (MT*,WY*)
Snowy Range Formation (MT)

Subunits:

FORMATION STATUS (alphabetical): Dry Creek Shale Member (MT*,WY*) or Dry Creek Member (MT), Grove Creek Limestone Member (MT*,WY*), Sage Limestone Member (MT*,WY*) or Sage Member (MT).

Geologic age:

Late Cambrian to Early Ordovician*

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

Type locality: on south slope of Castle Rock, about 2 mi downstream from ranch at junction of East Fork with Mill Creek, Park Co., MT. Section measured in N/2 SE/4 sec. 13, T. 6 S., R. 9 E. (Dorf and Lochman, 1940).

AAPG geologic province:

Bighorn basin
Central Montana uplift
Montana folded belt*
Snake River basin*
Sweetgrass arch
Wind River basin
Yellowstone province*