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ABSTRACT

The Rocky Mountain Fold and Thrust Belt west of Calgary, Alberta, has a long history of surface geologic mapping and hydrocarbon exploration. Many of these data are in the public domain. As a consequence of this excellent data set, the stratigraphy, sedimentology, and structural geology are very well understood. Major stratigraphic boundaries or facies transitions within Paleozoic units control structural detachment levels, the mechanical behavior of these lithotectonic units, and the structural styles observed. Fault terminations such as lateral ramps and relay zones often occur within depositional fairways comprised of less competent strata. The major facies transition near Field, British Columbia, and the resulting contrast in structural styles between the Eastern Main Ranges and Western Main Ranges will be observed. Two dip transects across the belt will document the foreland progression of major thrust faults or fault systems, and attempt to tie the age of these faults to the timing of terrane accretion and deformation events observed to the west within the southern Canadian Cordillera.

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