Abstract
The area lies in the eastern part of the Anahuac Desert Plateau and in the Gulf Coastal Plain and the deep canyon-cut area that lies between them. Volcanic plugs are prominent features of the Gulf Coastal Plain. The column consists of Lias, Cretaceous, Tertiary, and Quaternary formations. The eastern edge of the plateau is cut by pre-Tertiary, Tertiary, and Quaternary intrusions. There are extrusive Tertiary and Quaternary flows. The main structures are the Hidalgo anticline near the edge of the plateau and the South Field anticline near the Gulf Coast. Between the two is a broad low valley. It is probable that the petroleum of the South Field originated in the Lias and migrated upward through fractures to the top of the Tamasopo.
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