Geologic Unit: Cottonwood Canyon

Usage:

Cottonwood Canyon Member of Lodgepole Limestone of Madison Group (UT*,WY*, and MT*-local)
Cottonwood Canyon Member of Madison Limestone (WY*, and MT*-local)
Cottonwood Canyon Formation (UT)
A member of Lodgepole Limestone in southern MT, and of Madison Limestone in northern and west-central MT.

Geologic age:

Late Devonian and Early Mississippian (Famennian and Kinderhookian)*

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

Type section: on north wall of Cottonwood Canyon, about 1 mi east of the mouth, in sec. 34, T. 57 N., R. 93 W., Big Horn Co., WY. Named from Cottonwood Canyon on west side of northern Bighorn Mountains, 16 mi east of Lovell, in northern WY (Sandberg and Klapper, 1967).
Reference section (shale and siltstone facies): in Beartooth Mountains at Clarks Fork Canyon, north of river in NE/4 NE/4 sec. 7, T. 56 N., R. 103 W., Park Co., WY, in Deep Lake 15-min quadrangle (Sandberg and Klapper, 1967).
Subsurface reference section: depth-interval 5,806.9 to 5,819.2 ft in Pan American 72 Elk Basin Madison Unit well of Elk Basin oil field in northwestern Bighorn basin. Well is in NW/4 SE/4 sec. 30, T. 58 N., R. 99 W., Park Co., WY (Sandberg and Klapper, 1967).

AAPG geologic province:

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