Tucker (ibid., v. 52, p. 820-851, 1968) stated that faulting in the areas of the Karnes trough in northwestern Karnes County, Texas cannot be accurately dated, but that he believes it started after the Early Cretaceous, with the latest activity in the Sample System Faults after Early Miocene. Two additional wells not used by Tucker suggest that the age of faulting was contemporaneous with deposition.

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