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The Lynn Window in the Roberts Mountains thrust exposes 2,572 m of strata, predominantly carbonate rock, of Cambrian through Late Devonian age (carbonate, or eastern, assemblage). These strata include Hamburg Dolomite, Pogonip Group, Eureka Quartzite, Hanson Creek Formation, Roberts Mountains Formation, and Popovich Formation. The upper plate of the Roberts Mountains thrust is predominantly shale and chert (siliceous, or western, assemblage) or Ordovician and Silurian age that could represent at least 3,000 m of section. Thrust slices of an Upper Devonian limestone with abundant sand-sized clasts of quartz and chert (transitional assemblage) occur within the upper plate. The total known thickness of this limestone is 915 m. Several kinds of igneous rock intruded the Paleozoic sedimentary rocks, possibly as early as Paleozoic time and as late as Tertiary. Most of the intrusions are minor. In the Cretaceous, however, granodiorite (121±5 m.y.) and quartz monzonite (106±2 m.y.) intruded Paleozoic rocks, producing large contact metamorphic aureoles. In the early Tertiary, granodiorite (37±0.8 m.y.) and quartz latite (36.6±0.7 m.y.) intruded the siliceous rocks south of the Lynn Window, producing narrow contact metamorphic aureoles. Rhyodacite flows of Cretaceous or early Tertiary age were deposited on the Paleozoic siliceous rocks south of the Lynn Window. Rhyolitic welded tuff (14.2±3 m.y.) was deposited just west of the Lynn Window, probably contemporaneously with part of the Carlin Formation (sandstone, siltstone) of Regnier on the east side of the window. Deposits of late Tertiary and Quaternary age occur on both flanks of the window. The Antler orogeny in Late Devonian to Early Mississippian time produced the earliest deformation recorded in the area. The allochthonous siliceous and transitional assemblages were imbricated and brought into the area in the upper plate of the Roberts Mountains thrust. Large and minor folds in the allochthon are predominantly gently plunging to the north-northeast and south-southwest. During this episode, the autochthonous carbonate assemblage was severely deformed by thrusting. In the late Paleozoic or Mesozoic the carbonate aissembage was folded into a broad asymmetric anticline plunging 20° N.15° W. The west side of the anticline is overturned and thrust over the siliceous assemblage along the West Lynn thrust. Relatively minor, steep faults postdate the Antler orogeny and faulting occurred throughout the Mesozoic and Tertiary. The largest of these post-Antler faults, the Tuscarora fault, is along the east side of the southern Tuscarora Mountains; it is partly Pliocene in age. Fossils identified are Ordovician to Late Devonian in age. 2 RODEO CREEK NE AND WELCHES CANYON QUADRANGLES

Geology of the Rodeo Creek NE and Welches Canyon quadrangles, Eureka County, Nevada