Geologic Map of the Wickenburg 7.5' Quadrangle, Maricopa and Yavapai County, Arizona

This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wickenburg, Sam Powell Peak, Flores, and Vulture Peak) in the Wickenburg area. New surficial mapping was conducted throughout the 4-quadrangle mapping area and bedrock mapping was compiled from existing geologic maps. Together, these maps include detailed surficial mapping of alluvium from the Date Creek, Weaver, Wickenburg, and Vulture Mountains as well as ancestral deposits of the Hassayampa River. The relationships between relict and modern alluvial fan and Hassayampa River deposits and their positions relative to pre-existing bedrock topography presents a glimpse into the arrival and development of the modern Hassayampa River system. The Wickenburg 7 ½' Quadrangle straddles the boundary between southern Yavapai and northern Maricopa County and includes the towns of Wickenburg and Morristown, AZ. US Highway 60 passes through the quadrangle from SE to NW. The Hassayampa River flows southeast along the highway separating the Vulture Mountains to the southwest and Wickenburg Mountains to the east. The Vulture Mountains are part of a rugged terrain of dissected bedrock hills and valleys in contrast with the extensive alluvial piedmont emanating from the Wickenburg Mountains. Tributaries from both areas drain into the Hassayampa River, where incision has exposed axial basin-fill deposits overlain by ancestral Hassayampa River deposits. Bedrock pediment, hills, and inselbergs consist of Proterozoic metamorphic and igneous rocks, Cretaceous igneous intrusions, and extensive Neogene (Miocene) volcanic and hypabyssal, and associated terrestrial rocks.