Geologic mapping recently completed in four areas of northeastern Nevada indicates that major folds and thrusts are of post-Early Triassic age and probably are Jurassic or Cretaceous. Previously published data for northeastern Nevada lead to, or permit, the same conclusion. Basinal deposits of Early Triassic age in the northern Adobe Range are easterly derived clay and carbonate. The apparent lack of westerly derived siliceous orogenic sediments of Sonoma age (Late Permian to Early Triassic) suggests that the Sonoma orogeny took place at some unknown location far from northeastern Nevada and that rocks deformed then, the Golconda allochthon, were emplaced in northern Nevada at a later date.

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