The Cretaceous In The Caborca Santa Ana Region, Northern Sonora, Mexico.

Jacques Ayala, Cesar.

Etd

The Cretaceous In The Caborca Santa Ana Region, Northern Sonora, Mexico. Acceso Abierto Deposited

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Date Uploaded: 03/26/2018
Date Modified: 03/26/2018

Stratigraphic, sedimentologic and petrographic studies of the Lower and Upper Cretaceous in northwest Sonora show that deposition of the Bisbee Group occurred at the northern margin of a back-arc marine basin, and of the El Chanate Group and El Charro volcanic complex in a closed continental foreland basin. This study also finds that the Proterozoic-Paleozoic formations in northwest Sonora (Caborca terrane) were not part of the Cretaceous landscape, thus raising doubts about the existence of the Mojave-Sonora megashear.

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