Surficial Geology and Geologic Hazards of the Amado-Tubac Area, Santa Cruz and Pima Counties, Arizona, v. 2.0

This report, accompanying maps and GIS data describe the surficial geology, geomorphology, and geologic hazards of the rapidly developing Amado-Tubac area, south of the Green Valley area. The mapping covers the Amado and Tubac 7 1/2’ quadrangles (Figure 1). The map area is in unincorporated Santa Cruz and southern Pima Counties. It includes much of the southern part of the upper Santa Cruz Valley, between the Santa Rita Mountains on the east and the Tumacacori Mountains on the west. There are several potentially conflicting land use issues in the area covered by these maps. The Santa Rita and Tumacacori mountain ranges are public lands owned by the U.S. Forest Service. Several large ranches are located within the mapping area and are interspersed with state trust lands. Urbanization has occurred, and continues to occur, along the Santa Cruz River and around the communities of Arivaca Junction, Tubac, and Rio Rico, just south of the map area. Many areas of the Santa Rita piedmont have been subdivided and prepared for development, although development remains sparse. This report is intended to enhance our understanding of the surficial geology of the Amado-Tubac area and to aid in assessing and understanding geologic hazards in this area. (1 report, 2 map sheets; 1:24,000 scale; UTM Zone 12 projection).