Excerpt from Soil Survey of the Middle Gila Valley Area, Arizona
The Middle Gila Valley area is situated in the south - central part of Arizona, mainly in Pinal County, only 2 square miles being in Maricopa County. It lies in a region of isolated or discontinuous, barren, roc... ky peaks and ranges, mainly of eruptive and crystalline formations, which rise from Sloping or nearly level desert plains. This part of the State is recognized physiographically as the Desert region, in contrast to the much higher lying Plateau region Of sedi mentary rocks occupying the northern and northeastern parts of the State. As the title implies, the survey includes the middle valley Of the Gila River, which presents a contrast to both the upper valley, in the eastern part of the State, and the lower desert valley above the con¿uence of the Gila River with the Colorado.
The area surveyed is irregular in out line, and roughly y-shaped. Beginning at the mouth of the Gila River Canyon, about 5'miles northeast of Florence, it Spreads out westward and southwestward as a fan shaped area, which is soon divided into two arms by the Sa'caton Mountains, Em. 1, - Sketch map showing which it practically surrounds on the Gila north, east, and south. The northern arm.
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