Abstract
Deep seismic-reflection data which were collected by COCORP in central Nevada at ∼40°N latitude reveal a horizontally laminated, reflective lower crust and an upper crust containing prominent moderately dipping reflections from Cenozoic lava flows, basin fill, normal faults, older thrust: faults, and Paleozoic sediments. Prominent Moho reflections are seen at depths of 31–35 km, in agreement with refraction-based Moho depths for this area. The strongly layered character of the lower crust is best developed near the mid-Miocene Northern Nevada rift, suggesting that Cenozoic magmatism and ductile extension have played an important role in the development of this fabric. East-dipping reflections beneath southern Grass Valley in Lander County may locally disrupt an otherwise continuous “reflection Moho.”
