In the literature of geology, there are numerous descriptions of sedimentary deposits that demonstrably are related to movements on faults. There are also many attempts to demonstrate, by using the circumstantial evidence in sedimentary formations, the existence of active fault blocks while the sediments were accumulating. Some conclusions from studies of this sort are not wholly convincing. Generally, it is desirable to have contributory evidence, for localized strong warping may result in a sedimentary record that is suggestive of faulting. Study of areas in which both sedimentary and structural features are well displayed may supply criteria that have general application in problems of this kind.
Many parts of the Basin-and-Range province offer favorable opportunities to study the relation of sedimentation to large-scale faulting. In most parts of the region of interior drainage, however, observation in the vertical section is seriously limited by the continuous . . .