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TitleTriassic rocks in the Rocky mountain Foothills and Front Ranges of west-central Alberta and southern British Columbia between Athabasca river and Crowsnest pass
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGibson, D W
SourceGeological Survey of Canada, Open File 176, 1973, 73 pages (15 sheets), Open Access logo Open Access
Documentopen file
MapsPublication contains 13 maps
Map Info.geological, isopachs, 1:2,534,400
Mediapaper; on-line; digital
RelatedThis publication is superceded by Triassic Rocks of the southern Canadian Rocky Mountains
File formatpdf
NTS82E/09; 82E/10; 82E/11; 82E/12; 82F/09; 82F/10; 82F/11; 82F/12; 82F/13; 82F/14; 82F/15; 82F/16; 82G/09; 82G/10; 82G/11; 82G/12; 82G/13; 82G/14; 82G/15; 82G/16; 82H/11; 82H/12; 82H/13; 82H/14; 82I/03; 82I/04; 82I/05; 82I/06; 82I/11; 82I/12; 82I/13; 82I/14; 82J; 82K; 82L/01; 82L/02; 82L/07; 82L/08; 82L/09; 82L/10; 82L/15; 82L/16; 82M/01; 82M/02; 82M/07; 82M/08; 82M/09; 82M/10; 82M/15; 82M/16; 82N; 82O; 82P/03; 82P/04; 82P/05; 82P/06; 82P/11; 82P/12; 82P/13; 82P/14; 83A/03; 83A/04; 83A/05; 83A/06; 83A/11; 83A/12; 83A/13; 83A/14; 83B; 83C; 83D/01; 83D/02; 83D/07; 83D/08; 83D/09; 83D/10; 83D/15; 83D/16; 83E/01; 83E/02; 83E/07; 83E/08; 83E/09; 83E/10; 83E/15; 83E/16; 83F; 83G; 83H/03; 83H/04; 83H/05; 83H/06; 83H/11; 83H/12; 83H/13; 83H/14
Lat/Long WENS-119.0000 -113.0000 54.0000 49.0000
Subjectsregional geology; economic geology; industrial minerals; building stones; gas; gypsum; oil; paleocurrent analyses; paleoenvironment; phosphate; siltstones; sandstones; dolomites; shales; petrographic analyses; Llama Member; Phroso Siltstone Member; Rocky Mountains; Spray River Group; Starlight Evaporite Member; Sulphur Mountain Formation; Vega Siltstone Member; Whistler Member; Whitehorse Formation; Winnifred Member; Triassic
Illustrationsstratigraphic sections
Released1973 11 01; 2017 12 18
AbstractTriassic rocks in the southern Canadian Rockey Mountains comprise the Spray River Group, which is divided into the lower Sulphur Mountain Formation and the upper Whitehorse Formation. The Sulphur Mountain Formation consists of grey to rusty brown weathering siltstones, sandstones, silty limestones, dolomites, and shales that comprise, in ascending order, the Phroso Siltstone, the Vega Siltstone, the whistler, and the Llama Members. In the eastern Front Ranges and subsurface of the Foothills between Athabasca and Bow Rivers, the Vega Siltstone Member is characterized by a light grey to buff-weathering dolomite lentil herein named the Mackenzie Dolomite. The Whitehorse Formation consists of pale-weathering, variegated dolomites, limestones, sandstones, siltstones, and intraformational and/or
solution breccias, which are, throughout most of the region, divided into the Starlight Evaporite and Winnifred Members. In the Athabasca-Bow River region, the Starlight Evaporite Member contains a resistant light grey to buff-weathering sandstone lentil, herein named the Olympus Sandstone. Petrographic examination of Sulphur Mountain and Whitehorse strata indicates a composition of detrital quartz, orthoclase, microcline, and plagioclase feldspar, cellophane, layered silicates such as muscovite, clay, and clay-like minerals, opaque and accessory minerals such as pyrite, hematite, zircon, tourmaline, rutile, apatite and organic carbonaceous matter. Dolomite and calcite form significant concentrations, occurring as cement and matrix in the siltstones of the Sulphur Mountain Formation, and as well rounded detrital grains, ooliths, pellets, clasts, and skeletal fragments in both the Sulphur Mountain and Whitehorse Formations. Gypsum occurs sparingly. The limited mineral variety and concentration suggest that the rock components were derived from a source area of low relief, consisting of pre-existing sediments. Studies of HCl insoluble residues from the Sulphur Mountain Formation indicate a decrease in carbonate concentration toward the presumed source of detrital sediments in the east and northeast. Analyses of sedimentary directional structures in the overlying Whitehorse Formation suggest formation probably by longshore currents from the west and northwest. Sediments of the Sulphur Mountain Formation were deposited mainly in a shallow-water neritic environment, which in some regions probably formed part of a series of coalescing delta complexes, along the eastern margin of the Cordilleran Geosyncline. Sediments of the Whitehorse Formation are postulated to have been deposited in an arid to semi-arid, shallow water, intertidal or lagoonal environment.

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