Mesozoic rocks in west-central Arizona and southeastern California record an episode of uplift in Late Triassic to Middle Jurassic time. The main evidence for this uplift is an unconformity that is cut on Triassic to Proterozoic rocks and is overlain by a pre-160 Ma conglomerate containing clasts of Proterozoic crystalline rocks. The uplift is an important early Mesozoic paleogeographic feature and may be part of the long-sought source terrane for detritus in the Chinle Formation and other lower Mesozoic units of the Colorado Plateau.

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