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Four outcrops in the Guadalupe Mountains are investigated in order to evaluate two current models that describe the depositional setting of siltstones and sandstones in the Upper Guadalupian, Yates Formation. The outcrops are described and placed in their relative position along a dip-oriented cross section that is representative of the Yates Formation on the Northwest Shelf. Facies relations and cyclic stratigraphic sequences suggest that the siliciclastics were transported across a very shallow to subaerially exposed shelf during eustatic sea-level low stands and were trapped on the shelf during subsequent sea-level rises. Clastics near the shelf margin were reworked during the sea-level rises.

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