Geologic map of the Jumpup Canyon and Big Springs quadrangles, Mohave and Coconino County, Arizona [Big Springs, Sowats Spring, Jumpup Point, Grama Spring, Warm Springs Canyon, Toothpick Ridge, Gunsight Point, and Findlay Tank 7.5 min.]

Billingsley, G.H., 1992, Geologic map of the Jumpup Canyon and Big Springs quadrangles, Mohave and Coconino County, Arizona [Big Springs, Sowats Spring, Jumpup Point, Grama Spring, Warm Springs Canyon, Toothpick Ridge, Gunsight Point, and Findlay Tank 7.5 min.]: U.S. Geological Survey Miscellaneous Investigations Series Map I-2290, 1 sheet, scale 1:62,500.