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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Palaeomagnetism and Differential Rotation in the Lewis Thrust Plate
ABSTRACT
The surface trace of the Laramide Lewis thrust in the southeastern Cordillera of Canada exhibits a fundamental change in direction of approximately 35 degrees from the Flathead to the Clark Range. The continuity of structural and stratigraphic units throughout this area would suggest that the Lewis thrust plate moved as a single, coherent, tectonic unit with no major transcurrent or transverse normal faulting. Palaeomagnetic data support this contention as there was, within the limits of error, no measurable differential rotation between the Flathead and the Clark Ranges. The change in trend may possibly be related to the geometry of the thrust surface established during the initial stages of Laramide movement.
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