The Newberry Springs 30 x 60 quadrangle in the central and eastern Mojave Desert of Southern California (fig. 1) contains several mountain ranges including, from east to west, the Bristol, Cady, Bullion, Lava Bed, Rodman, Fry, Newberry, Calico, and Ord Mountains (fig. 2). The ephemeral Mojave River flows through the northwestern part of the map area. Its headwaters lie in the San Bernardino Mountains southwest of the Newberry Springs map area and its terminus is Silver Lake, east of the map area and just north of the town of Baker, California. Piedmont alluvial plains dominate much of the landscape and locally terminate downhill at the base of the closed basins of Broadwell, Lavic, Troy, Galway, and Lucerne (northern end) dry lakes. The Newberry Springs map area contains three cinder cones and associated basaltic lava fields, both probably Quaternary in age: Pisgah Crater, Sunshine Crater, and an unnamed crater in the Newberry mountains. The lava flows from these craters are prominent features in the central portion of the map.