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NON-TECHNICAL SUMMARY This study was based on available published literature. Although no field investigation was conducted in the Prescott National Forest to the west of the Verde River, a field investigation was conducted in the summer of 1994 by this author on the Coconino National Forest, to the east of the Verde River, where units of surficial materials of the same age and similar character are found (Cox, 1995). The intent of this evaluation of sand and gravel resources in the Prescott National Forest and adjacent areas in the Verde Valley, is to provide the land managers of the U.S. Forest Service with a map that delineates sandand gravel-bearing geologic units. The map distinguishes (1) sandand gravel-bearing units that are limited to channels from those that are not, (2) sandand gravel-bearing units that are thin (generally less than 40 feet thick which is one contour interval on the topographic maps) from those that are locally thick (generally 40 feet or more), (3) sandand gravel-bearing units that are poorly sorted from those that are well-sorted4, (4) sandand gravel-bearing units that have little or no soil development from those that have greater degrees of soil development and lithification, (5) and sandand gravel-bearing units that support riparian vegetation from those that do not. These distinctive characteristics are related to the geologic age or depositional setting of the rock materials and can be distinguished where areas are mapped in detail. 4 Deposits of sand and gravel are usually more desirable for commercial development if not too well sorted (J. Bliss).

u.s. geological survey open file report/open-file report

An evaluation of sand and gravel resources in and near the Prescott National Forest in the Verde Valley, Arizona, with a section on evaluation of sand and gravel resources using selected engineering variables