![]() The geomorphic expression of the Overton Arm basin assumes the form of a rhomboid shaped topographic low clearly indicated by the shape of the Overton Arm of Lake Mead once the lake crosses into the step-over region. The Overton Arm basin and the Las Vegas Valley basins are deep pull-apart basins formed by extensional stepovers along the major strike-slip systems. The geometry of the push-up is that of a strongly asymmetric anticline in the hanging wall of a high-angle northwest trending reverse fault that marks the southwestern boundary of the stepover region. For example, along the Lake Mead Fault System, the Echo Hills are a contractional feature located within a right-stepover of a left-lateral fault. ![]() The interaction of the discontinuous strike-slip fault segments generates both regional and local deformation that is consistent with the known kinematics of strike-slip faulting. The strike-slip systems are shown to be composed of discrete, discontinuous fault segments. ![]() The structural characteristics of two major strike-slip systems in the vicinity of Las Vegas, the left-lateral Lake Mead Fault System and the right-lateral Las Vegas Valley Shear Zone, are documented using both geological and geophysical data at various scales of observations and includes detailed field mapping at 1:10,000. Major strike-slip faults are common structural features in the late-Cenozoic tectonic framework of the Basin and Range and are the subject of this study. The Lake Mead Fault System and the Las Vegas Valley Shear Zone: Strike-slip faulting and associated deformation in the Basin and Range, southeastern Nevada
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