Geologic Map of Portions of the Fort McDowell and McDowell Peak Quadrangles, Maricopa County, Arizona

This map depicts both the bedrock geology and the general ages and distribution of Late Tertiary and Quaternary deposits and geomorphic surfaces in the northern part of the lower Verde River Valley, in Maricopa County. The map area includes portions of the Fort McDowell and McDowell Peak 7.5' U.S.G.S. topographic quadrangles (Figure 1). The region studied encompasses the region between the northern end of the McDowell Mountains on the west to about one mile east of the Verde River on the east. Mapping of the surficial deposits was based both on field observations and interpretation of black-and-white, 1:48,000-scale aerial photographs (dated 12-9-90) purchased from the Arizona Department of Transportation Photogrammetry and Mapping Division.