ng RUIN URE ay GENERAD DESCRIPTION Phe pias ‘of the . ee of different. ages ‘bears a. Nee marked relationship to the topographical and structural divisions. This feature may be illustrated from east to west as follows :. (1)\"Strata of Upper Cretaceous age form the largest part of tho. flat-lying beds of the Plains area, which includes the plateau ‘cast. of thé ‘Highway;‘(2) strata of Lower Cretaceous age occupy an inter- mediate, transitional belt of gentle folds and, moderate relief; . (3) strata of Triassic age form the eastern range of mountains,. about 15 miles wide, characterized by broad folds and some thrust faulting; (4) strata of Palaeozoic age form the main mountain range, with a relief slightly higher than the belt of Triassic rocks. of "6 The changé-in the type of structures between the flat- eae ‘beds:'of the.Plains and the broad folds of the mountains is. gradational, :The size of the folds as well as the intensity of folding. increases from east to west. The belt of Triassic rocks contains large folds and a number of thrust faults _with stratigraphic displacements of 1,000. feet or less. A fault of. this type underlies Klingzut Mountain where - aa crosses Sikanni Chief River, and another _ one crosses the river 5S miles farther west. Pink Mountain is be- lieved ue form : Pea of a thrust faulted: block... “Most! of the: folds renin the area ee show Broeurenis and- this. feature is interpreted.as the result of folding rather than faulting. : The gentle folds to the east have.dips of from 5. to 10 degrees, but. these increase to 50 degrees on the broader, larger folds tothe west. The thick sections of resistant Triassic. and Bullhead: strata: may in part be responsible for the type of structures in this‘area. The-mountain building stresses. that produced. the- Rocky Moufite inshave’ been transmitted farther from the mountains in this \ northern area producing folds, whereas in southern Alberta faulting has ‘prevented the transmission of eaniias stresses. for. as. shea, a eeranee vere ae mountains. . : A eaUla eee OU ney east, Uae “The enon Aneinaiea pe sragiry: Sage of aye Triassic mountain range, which includes Klingzut oT a are described nie more: deta tl in Nese following Paes Sarna ar a an Pay entices nee PInK MOUNTAIN, ANTIOLING Senet d "pink. Monee ds an anticlinal structure paliered to el bounded ..on ‘ate eastern side by @ west-dipping thrust fault. Both & limbs have dips averaging from 30 to 60 degrees. Some of the beds along the: cast: limb north of Halfway River are overturned. The crest is: broad with gentle dips. The structure has a length of about 30. miles. It was not investigated south of Halfway River. but the topographical expression continues south almost to Cypress Creek. The greatest relief is 4 miles north of Halfway River..where..it has an CRS aRO a of gine 2 900 feet. ahs The evel ces Regie on ene sysnrnvenchay are largely the hard,. , qev iis ‘sandstone strata of the lower Bullhead-group. Triassic, beds are exposed where creck and river channels have cut into and across thé. eRe NAgte ay The niet See structural part of the anticline corresponds with that part of the mountain having the greatest relief. The south closure between the high point and Halfway River is about 500 feet