The Llano region (Fig. 1) is characterized by northeastward-trending normal faults too numerous to present at page scale. Illustrative of this fault system is the Hall uplift, a horst named for the old town of Hall, in San Saba County. The probable contemporaneity of the Hall uplift with other similarly trending fault features in the region makes its age determination especially important because the Hall uplift has fault-related flank deposits sufficiently fossiliferous for precise dating.

A cursory glance at geologic maps of the Llano region reveals pre-Cretaceous faults that cut Marble Falls and older rocks. Cloud and Barnes...

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