Upgrader plant at the Monument No. 2 site Apache County, Arizona, circa 1959. Comb Ridge is on the skyline. (From Atomic Energy Commission films.) The No. 2 ore deposit is in the basal Shinarump Member of the Triassic Chinle Formation. Illustration from Chenoweth, W.L., 2011, The Uranium-Vanadium Production History of the Monument No. 2 Site Monument Valley, Apache County, Arizona: Arizona Geological Survey Contributed Report CR-11-P, 26 p. Available online at http://repository.azgs.az.gov/uri_gin/azgs/dlio/1368.