Geologic Map of the Little Horn Mountains 30′ X 60′ Quadrangle, West-Central Arizona

The Arizona Geological Survey has just released an updated version of the Little Horn Mountains geology. This area is west of Phoenix and borders the Kofa National Wildlife Refuge.

From the author’s description, “This compilation geologic map is a new product that builds upon several past compilations of the same area (Demsey, 1990; Spencer, 1995, Korroch et al., 1997) and contains significant updates across the map area. Some elements from each prior compilation were incorporated, some were refined, and other elements were replaced with new 1:100,000-scale geologic mapping. The bedrock geology has only been minimally changed from that of Spencer (1995), with critical changes coming from new mapping of areas such as Cemetery Ridge and the incorporation of new U-Pb zircon geochronologic results to better constrain unit ages. The surficial geology has been significantly modified from reconnaissance 1:100,000-scale geologic mapping using relatively generalized surficial units.”

See the map and report here: http://repository.azgs.az.gov/uri_gin/azgs/dlio/2023