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Geochronologic, structural, and metamorphic data obtained from the hinter-land of the Canadian Cordillera indicate that middle-crust ductile deformation was diachronous and coincided temporally with thrust propagation in the Rocky Mountain Thrust-and-fold Belt. Rocks currently at the highest structural level were deeply buried and then exhumed to upper-crust levels during the Middle Jurassic, when the orogenic wedge was in its early stages of evolution. However, structurally deeper rocks were buried and then exhumed at progressively more recent times, such that the deepest exposed level was not buried until the Eocene. This late stage of burial coincided with the final stages...

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