Bull Ridge Member of Mission Canyon Limestone —This member also does not vary greatly from equivalentbeds to the south. However, the solution zone at the baseof the member is somewhat thinner (10 to 25 feet thick),although the maximum thickness of the member (120 feet)is greater than it is in the Wyoming Province. Moreover,several thin terrigenous intervals occur above the uppersolution zone at most localities. T h e thickness of themember is quite variable (10 to 120 feet) owing to thevarying depth of post-Madison

Cliffy limestone member of Mission Canyon Lime-stone— This member is essentially the same as its expression in the Wyoming Province, differing chiefly in itsslightly greater thickness. It consists of cliff-forming limestone overlying a basal solution breccia (Figure 9). Thesolution breccia (lower solution zone) is about 25 to 50

The lower limestonem e m b e r is i n t e r p r e t e d as a s h a l l o w - w a t e r s e d i m e n tdeposited in a generally less restricted environment thanits equivalent to the south

the upper beds are in part shattered and brecciated likethose of the cherty dolomite member of the WyomingProvince. Stromatolites occur in some of the limestonebeds. Fossils are generally rare except for their occurrencein the lower oolitic beds, which contain a fauna of Osageanage similar to, but less diversified than, that of the underlying Woodhurst Limestone Member

Lower limestone member of Mission Canyon Lime-stone— The lowest unit of the Mission Canyon Limestoneis a cherty sequence of limestone and dolomite about 280to 325 feet thick that is the time-stratigraphic equivalentof the cherty dolomite member to the south. This unitbegins with thick, commonly cross-bedded, crinoidal oos-parite strata that stand in sharp contrast to the thinnerbeds of the underlying Lodgepole Limestone. The upperpart of the member consists predominantly of interbeddedfine-grained limestone and dolomite. At some localities

Woodhurst Limestone Member of Lodgepole Lime-stone — The Woodhurst in this area (Figure 8) is verysimilar to its expression in the Wyoming Province, differing by its slightly increased t e r r i g e n o u s c o n t e n t andslightly increased thickness (340 to 378 feet

represents an environment of somewhat deeper water than thatof t h e lower d o l o m i t e m e m b e r .

Identifiable fossils are rare, consisting of a fewsmall solitary corals, brachiopods, and bryozoans. Cono-donts from this unit belong to the Siphonodella crenultaZone, which is of Kinderhookian age.

Paine Shale Member of Lodgepole Limestone — ThePaine in this area consists of about 110 to 155 feet ofpredominantly thin-bedded, dark, fine-grained, verycherty limestone (Figure 7). Most of the limestone bedsappear to be micrite or pelletal limestone, but coarsegrained bioclastic debris is also present, particularly in thelower 20 to 30 feet

Cottonwood Canyon Member of Lodgepole Limestone— This member is greatly reduced from its expressionin t h e s o u t h e r n part of t h e Beartooth M o u n t a i n s . Itincludes only 2 to 3 feet of silty, dark, conodont-bearingshale and mudstone noted at three localities. It was notrecorded by Richards (1957) in the Shell Mountain section. The Cottonwood Canyon Member is slightly youngerin this province than in the Wyoming Province; its cono-dont fauna ranges from highest Siphonodella sandbergi-S.duplicata Zone to Lower Siphonodella crenulta Zone