Geology of the Florence Junction and Southern Portion of the Weavers Needle 7.5' Quadrangles, Pinal County, Arizona
The study area is situated along the southern edge of the Superstition Mountains approximately 40 miles east of the greater Phoenix metropolitan area (Figure 1). Geology is dominated by mid-Tertiary volcanic rocks of the Superior volcanic field (Ransome, 1903), and these rocks depostionally overlie a crystalline basement of early Proterozoic Pinal Schist intruded by middle Proterozoic granitoids. In some areas a relatively thin sequence of the Middle Proterozoic Apache Group occurs along the contact between these two rock types.
Ferguson, C.A. and Skotnicki, S.J., 1995, Geology of the Florence Junction and southern portion of the Weavers Needle 7.5' Quadrangles, Pinal County, Arizona: Arizona Geological Survey Open-File Report 95-10, includes 1:24,000 scale geologic map, cross-sections, 27 p.
The draft EIS public comment period closed November 7, 2019. All 30,000+ comment submittals are now under review for consideration in the compilation of the final EIS.