The geologic data of northern Mexico are critical to understanding the timing and processes of Mesozoic development of the southern part of the North American continent. The recent study of the Lampazos area, east-central Sonora by Monreal and Longoria (2000) presents basic geologic data and develops an interesting hypothesis about translational faulting of the region. They suggest significantly different interpretations of the structural geology, in the lithostratigraphic classification, and of the ages of the Lower Cretaceous succession of that region than previously published (González-León, 1988; Scott and González-León, 1991).

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Our intention here is to clarify the geologic...

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