The lower Frio Formation in eastern Brazoria County, upper Texas Gulf Coast, was deposited in a high-constructive deltaic environment in the Houston delta system. Constructive elements of the stacked, elongate to lobate deltas that were intersected in core are storm-induced delta-front splays, delta-front slump deposits, and distributary-mouth bar, distributary channel, and delta-plain assemblages. Reworked and winnowed abandonment facies are volumetrically insignificant relative to constructive elements and are subdivided into a cross-bedded shoreface-foreshore subfacies and a cyclic sequence of fine-grained storm deposits on the distal delta front. Micropaleontologic evidence indicates that deposition of constructive and abandonment facies took place in water depths of ess than 120 ft (36 m).

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