Thursday, April 26, 2012

Geologic Map of Detrital, Hualapai, and Sacramento Valleys and Surrounding Areas, Northwest Arizona

The USGS released a compilation 1:250,000-scale geologic map and report covering the Detrital, Hualapai, and Sacramento valleys in northwest Arizona, with the purpose of "improving understanding of the geology and geohydrology of the basins beneath those valleys." The map was compiled from existing geologic mapping, augmented by digital photogeologic reconnaissance mapping. The most recent geologic map for the area, and the only digital one, is the 1:1,000,000-scale Geologic Map of Arizona by AZGS.

Ref:  Beard, L. Sue, Kennedy, Jeffrey, Truini, Margot, and Felger, Tracey, 2011, Geologic map of Detrital, Hualapai, and Sacramento Valleys and surrounding areas, northwest Arizona: U.S. Geological Survey Open-File Report 2011–1225, pamphlet 43 p., 1 map sheet, scale 1:250,000, available at

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