Abstract

Upper Triassic nonmarine sandstones and shales of the Dockum group occupy a widespread area in W. Texas. The source area(s) for these beds has been a subject of varied opinion. Dip directions of foreset beds within the commonly cross-bedded sandstones were studied at 108 outcrops scattered throughout 7 counties in order to determine the direction of regional paleocurrents. Results show a predominance of dips to the NW. and W. The inferred source areas lie mainly to the SE. and E. of the depositional area. The Llano uplift region of central Texas, lying to the SE. of the area studied, was a major contributor of sediments during Late Triassic time.

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