Thin-section studies of Cretaceous-Eocene sandstones deposited in troughs and platform zones (both stable and unstable) in the west Venezuelan basin lead to the conclusion that sedimentary textures and textural maturity were controlled primarily by the depositional environment rather than tectonic factors. Differences in petrographic types, detrital mineralogy, and mineralogic maturity of the sandstones appear to reflect the petrography and conditions of weathering and erosion in source areas. The results of the investigation suggest that caution should be used in applying the concept of tectonic control of sediment characteristics to sandstone genesis and classification.

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