Named "provisionally" for the town of Gold Road in sec 11, T19N, R20W, Mohave Co, AZ in the Plateau sedimentary province. No type locality designated. Directly overlies Oatman andesite (new) and is overlain by the Flag Spring trachyte (new). Oatman-Gold Road contact rarely exposed. There is no separating layer of sedimentary rock but the latite contrasts with the green andesite of the Oatman. Is well exposed in cliffs along Cottonwood Canyon north of Gold Road. Consists mostly of biotitic latite and some rhyolite. Maximum thickness estimated as 3,000 to 4,000 ft. Occurs as flows and tuffs with a minor amount of intrusive rock. Flows vary from crystallized latite to black obsidian-like pumiceous or lithophysal that could be glassy rhyolite. Under the microscope, the Gold Road has fresh feldspars, near andesine in composition. Also has biotite, monoclinic pyroxene, apatite, zircon, magnetite, and titanite. Some hypersthene, quartz, and rarely amphibolite. Geologic map. Cross section. Tertiary age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Name Gold Road Latite changed to Gold Road Dacite. Consists of lithic ash beds, vent breccias, and flows. Ranges from subalkalic to alkalic dacite. Lower part has 30 percent phenocrysts of plagioclase, clinopyroxene, orthopyroxene, and minor amounts of quartz, biotite, and potassium feldspar. Upper part averages 40 percent of same phenocrysts, but no quartz present. Has maximum thickness of 240 m. Was probably as much as 900 m thick before erosion and deposition of Antelope Rhyolite. Overlies Oatman Andesite. Underlies Antelope Rhyolite. Mapped (geologic maps) in east part of district, east of Oatman, Mohave Co, AZ in the Plateau sedimentary province. Biotite (K-Ar) from Gold Road yielded a date of 18.6 +/-0.9 Ma. Age modified from Tertiary to Miocene. Chemical analyses.

Source: GNU records (USGS DDS-6; Denver GNULEX).