The San Marcos arch has been a persistent positive area since Late Triassic or Early Jurassic time. Oil has accumulated in practically all types of structural and stratigraphic traps in this area, and is produced from numerous Upper Cretaceous and Tertiary strata. Stratigraphic and paleoenvironmental studies suggest that the Upper Jurassic and Lower Cretaceous strata should also contain favorable conditions for stratigraphic entrapment of hydrocarbons.

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