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Geological Survey research 1980 Geological Survey research 1980

A summary of recent significant scientific and economic results accompanied by a list of geologic, hydrologic, and cartographic investigations in progress.
Authors
Water Resources Division U.S. Geological Survey

Metamorphic infrastructure in the northern Ruby Mountains, Nevada Metamorphic infrastructure in the northern Ruby Mountains, Nevada

The metamorphic complex of the northern Ruby Mountains in northeastern Nevada exposes Paleozoic strata that are metamorphosed to sillimanite grade, migmatized, and recumbently folded. Nappes are variously overturned to the east, north, south, and west. The deeper part of this metamorphic infrastructure is a migmatitic zone pervaded by pegmatitic two-mica granite. A structurally higher...
Authors
Keith A. Howard

Evidence for tectonic movement of the Las Positas Fault, Alameda County, California Evidence for tectonic movement of the Las Positas Fault, Alameda County, California

On October 29, 1979, a new exposure of the Las Positas fault zone near Livermore, California, was created by excavation of a creek bank along Arroyo Seco. The face of the bank was cleaned by geologists of Lawrence Livermore Laboratory (Livermore, California) to obtain a better and more complete view of the fault. The excavation was undertaken by Lawrence Livermore Laboratory as part of a...
Authors
Darrell G. Herd, Earl E. Brabb
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