Lower Mesozoic facies and crosscutting sequence boundaries: Constraints on displacement of the Caborca terrane
John E. Marzolf, Thomas H. Anderson, 2005. "Lower Mesozoic facies and crosscutting sequence boundaries: Constraints on displacement of the Caborca terrane", The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives, Thomas H. Anderson, Jonathan A. Nourse, James W. McKee, Maureen B. Steiner
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Five Triassic and Jurassic tectonosequences recognized on the Colorado Plateau have been identified within the Caborca terrane in Sonora, Mexico. Piercing lines defined by truncation of tectonosequence boundaries constrain the pre-offset position of the terrane. Restoration of 1040 ± 290 km of Middle to Late Jurassic left slip along the Mojave-Sonora megashear places the Caborca block in a paleogeographic position that satisfies the constraints provided by truncated tectonosequences and yields predictable regional facies distributions for all tectonosequences. The restoration is consistent with previous estimates of displacements based upon offset of correlative (1) terrains of crystalline basement and (2) pre-Oxfordian cover.