The Trinity group, except in Red River area, is divided into three stratigraphic units which in ascending order are Travis Peak or "Basement Sands," Glen Rose limestone, and Paluxy sands. The coarse-grained clastics, larger than [1]/[16] min., are characterized by texture, degree of abrasional wear, and heavy mineral assemblages. The fine-grained materials, the silt and clay sizes, constitute about 50 per cent of some of the deposits. The limestones were analyzed for carbonates and insoluble residues.

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