Upper Pliocene and Quaternary deposits were mapped in an area of 1,800 km² in the west-central San Joaquin Valley and adjacent Diablo Range. The upper Pliocene and Pleistocene Tulare Formation, which consists of alluvial sand, gravel, silt, and clay and locally dips 20°, is overlain by a sequence of six units, each 0 to 20 m thick, each the result of an episode of deposition of alluvium from the Diablo Range. Erosional unconformities and soils between the units record the intervening periods. The units consist of unconsolidated gravel, sand, silt, and clay, with textures and sedimentary structures indicating deposition...