The following report is based upon an investigation made for the purpose of obtaining from the Payson region, or Green Valley mining district, geological data. that might be of interest to mining men, prospectors, and investors. These data were obtained during a two weeks' visit in July, 1923, and a brief visit in March, 1924. The geologic base was for the most part prepared in 1920, during the course of the reconnaissance survey for the new geologic map of Arizona; and the topographic base map used for this region was the United States Geological Survey's Verde quadrangle topographic sheet, surveyed in 1885, on the scale of about four miles to the inch, with a 200-foot contour interval. The region examined lies in the mountainous northern part of Gila County, in a portion of the area topographically mapped in 1885 by the United States Geological Survey as the Verde quadrangle, and is within the Tonto Basin and East Verde drainages.