Description

This geologic map and report cover the entire Cibola 7 ½’ Quadrangle and the northwestern part of the Cibola SE 7 ½’ Quadrangle, in La Paz County, Arizona, and Imperial County, California (Figure 1). Geologic mapping was done on the Arizona part of the map area primarily by Arizona Geological Survey (AZGS) personnel, with key observations contributed by Brennan O’Connell of the University of Oregon. Mapping in California was done primarily by our cooperator with U.S. Geological Survey, Kyle House. Geologic mapping was done under the National Cooperative Geologic Mapping Program, as specified in the National Geologic Mapping Act of 1992, and was jointly funded by the AZGS and the USGS under STATEMAP assistance award # G13AC00374, and the USGS FEDMAP project “Geology and Geomorphology of the Lower Colorado River”. Mapping was compiled digitally using ESRI ArcGIS software. The primary purpose of this text accompanying the geologic map is to more fully describe and explore the implications of some of the key geologic units that are exposed in the map area.