The general setting of the area, including physiography, climate, and history; detailed descriptions of the geologic units, including distribution, stratigraphy, and age; structure, including faulting, folding, thrusting, and calderas; and mineral deposits of the Tonopah, Divide, Ray, Klondyke, and Lone Mountain districts; bibliography and index. A geochemical reconnaissance of the same area is reported in Bulletin 96; detailed b/w geochemical maps of the same area for 13 different elements are available at 1:48,000 in Open-File Report 81-2; regional discussions in Bulletin 78, Bulletin 99A, and Bulletin 99B.