Abstract
Interpreted seismic reflection data from the Oldman River area of the southern Alberta Foothills reveals the progressive eastward advancement of triangle zone deformation into the Alberta Foreland Basin. Seismic data, of mid-1970s vintage, along an east-west transect across the triangle zone were reprocessed in order to enhance images of shallow reflectors and provide linkage between surface and subsurface structural interpretations. Interpretation was assisted by the analysis of velocity anomalies caused by lateral changes in thicknesses of rocks with relatively low seismic velocities. It was found that deep structures are not tightly folded or overturned, and a sequence of successively younger backthrusts developed progressively toward the foreland. Important detachment horizons are within the St. Mary River and Bearpaw formations, and near the base of the Belly River Group. Ramps in the deeper thrusts have developed above normal faults that cut Paleozoic and basement rocks.
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