The Buckeye Hills are located approximately 30-40 km west-southwest of Phoenix, Arizona, directly south of the Town of Buckeye (see figure 1). Regionally, the Buckeye Hills are sandwiched between two broad alluvial bajadas. To the north, a vast alluvial plain slopes southward toward the hills from the White Tank Mountains, while to the south, another broad bajada slopes northward from the Maricopa Mountains, also toward the hills. The Gila River skirts the northern edge of the bedrock as it flows west across the northern part of the quadrangle. Although some of the taller hills project over 600 feet above the surrounding plain, topographic relief in the map area is typically very low. Much of the bedrock has been eroded into low-relief pediments. From a distance these pediments deceptively resemble extensive alluvial plains. Several episodes of erosion, sedimentation, and entrenchment have resulted in a myriad of dissected alluvial deposits across the pediments.