Title
The Cordilleran Miogeosyncline in North America: Geologic Evolution and Tectonic Nature (Lecture Notes in Earth Sciences, 86),Used
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Steep crustalscale faults, having their origins in the Late Archean and Early Proterozoic and trending NESW, which define the fundamental block lithospheric structure of the North American craton, are seen from geological and geophysical evidence to continue far into the interior of the Late ProterozoicPhanerozoic Canadian Cordilleran mobile megabelt. This suggests that variously reworked excratonic basement blocks underlie much of the Cordillera. The western edge of the modern craton is probably near the Rocky MountainOmineca belt boundary; the Rocky Mountain foldandthrust belt on the east side of the Cordillera is evidently rootless and overlies the undisturbed cratonic basement. Phanerozoic differences between the Cordilleran tectonic belts, resulting from a long, dissimilar, multicycle history of waxing and waning orogenesis apparent from the rock record, lie chiefly in the degree of indigenous tectonic remobilization and reworking of the ancient crust.
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