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$USGT The Ruby Mountains and adjoining East Humboldt Range form one of more than a score of North American Cordilleran metamorphic core complexes (Crittenden and others, 1980). The Lamoille 7.5-minute Quadrangle includes part of the core complex where the Ruby Mountains are accessible by car via Lamoille Canyon, as described in several field guides (Snoke and Howard, 1984; Howard, 1987; Snoke and others, 1997). The quadrangle lies within the area of a geologic map of the Ruby Mountains (Howard and others, 1979, 1:125,000-scale). Geologic maps of adjacent quadrangles can be found in Howard (1966, 1:24,000), Smith and Howard (1977, 1:62,500), and MacCready and others (1997, ~1:45,500). In brief, the core complex in the quadrangle exposes Neoproterozoic and lower Paleozoic miogeoclinal strata that were thrust-faulted, deeply buried, metamorphosed, recumbently folded, and intruded pervasively by Cretaceous to Oligocene granitoids. Cenozoic unroofing accompanied footwall rise below an inclined down-to-the-west extensional fault system. That fault system imprinted a ductilely sheared mylonitic carapace on the now-exposed deep footwall in Oligocene and Miocene time, and has continued into Holocene time to move as a gently dipping near-surface brittle fault (Howard, 1992).