Approximately 3,000 feet of Devonian through Permian strata are exposed beneath Tertiary volcanics in the southern Maverick Springs Range. The oldest unit consists of 430 feet of gray-brown Devonian Simonson Dolomite. Conformably overlying the Simonson is 876 feet of gray Guilmette Limestone. The Devonian-Mississippian Pilot Shale, 109 feet of red, calcareous sandstone, is overlain by 81 of Mississippian gray Joana Limestone. The overlying Chainman Shale consists of 425 feet of black calcareous shale. Conformably above the Chainman is 680 feet of the Mississippian-Pennsylvanian Diamond Peak Formation which consists of a pebble conglomerate. Overlying the Diamond Peak is 198 feet of gray, cherty, Pennsylvanian Ely Limestone. A stratigraphic break occurs between the Ely and the Permian Pequop Formation which consists of 89 feet of gray, sandy, fossiliferous limestone. Approximately 142 feet of Tertiary tuffs and flows unconformably overlie a portion of the tilted Paleozoic strata. The Paleozoic section strikes northeasterly and dips to the southeast. Normal faults are contained within rocks of all ages. Truncation of the Riepetown Formation on the western side of the north Mavericks suggests the existence of a western major range front-fault. During the Antler Orogeny (Devonian-Mississippian), eugeosynclinal rocks were thrust over miogeosynclinal rocks throughout the western Cordillera. Evidence of this event is contained in the Diamond Peak Formation of the Maverick Springs Range. Block-faulting and major volcanism began in the Early Tertiary, probably Late Eocene or Early Oligocene times, and were widespread through Later Miocene and Early Pliocene. These Cenozoic events possibly owe their origin to subduction of the East Pacific Rise under the province during Late Miocene or Early Pliocene.