Geology, Spray Lakes Reservoir, Alberta-British Columbia / [by] M.E. McMechan. : M183-1/14-2011E-PDF

"Spray Lakes Reservoir map area (NTS 82 J/14, 1:50 000 scale) straddles parts of the Foothills, Front Ranges, and Main Ranges subdivisions of the Southern Canadian Rocky Mountains from northeast to southwest. Four major thrust sheets (McConnell, Rundle, Sulphur Mountain, and Bourgeau) carrying Paleozoic carbonate and clastic strata and Mesozoic clastic strata dominate the structural geology. Imbricate thrust slices and duplexes are commonly developed along the leading edge of each major thrust sheet. Map relationships show significant displacement transfer and kinematic linkage occurred between individual thrust faults. The Paleozoic section thickens dramatically to the southwest across the map area. Folds dominate the structural style in the Bourgeau thrust sheet where Upper Devonian Fairholme Group strata have changed facies into basinal shale and thick sections of cleaved Ordovician strata are preserved. The Main Ranges transition occurs at a culmination in the Bourgeau thrust sheet and a change to a Lower Paleozoic level of exposure"--Abstract.

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