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, rocky peaks and ranges, mainly of eruptive and crystalline formations, which rise from mping 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 confluence of the Gila River with the Colorado. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.