Name: Plio-Quaternary volcanic rocks

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Description: Active faulting and volcanism represent features and events that could potentially compromise the ability of a geologic repository to isolate waste. The major region of active faulting in the US occupies many of the western states while the most active areas of volcanism are the Cascade volcanoes of Washington and Oregon and the Snake River/Yellowstone system of Idaho and Wyoming. Scattered basaltic volcanoes of small volume have erupted during the last 10,000 years in Arizona, New Mexico, Utah, California, and Oregon. Data for their distribution of faults and volcanoes in the US are important for identifying regions of active tectonics.

Copyright Text: USGS (2006); Garrity and Soller (2009), LANL

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Spatial Reference: 102100  (3857)

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• UNIT_ABBRE ( type: esriFieldTypeString, alias: Unit Abbreviation, length: 8 )
• ROCKTYPE ( type: esriFieldTypeString, alias: Rock Type, length: 40 )
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