Abstract
ABSTRACT The middle and upper Frio individually constitute complete depositional sequences, and sand distribution in each is related to stacking patterns associated with the specific systems tracts. The middle Frio overlies the 30 m.y. unconformity as dated by the nannofossils Sphenolithus distentus and Sphenolithus predistentus and consists of a slope fan, a lowstand prograding wedge, a transgressive systems tract, and a highstand unit. The upper Frio overlies the 28.4 m.y. unconformity; in the study area, it consists of two sequences and contains the 26.5 m.y. unconformity. Each of these sequences has a prograding wedge, a transgressive systems tract, and a very thin highstand unit but lack slope fans in this updip position. Its upper boundary is the 25.5 m.y. unconformity based on the occurrence of Reticulofinestra bisectus. Potential new stratigraphic plays are recognized for this highly explored and highly prolific formation.
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