Unconsolidated and consolidated, locally derived, fluvial and pond deposits are being dissected within several valleys. These deposits are composed of gravel, sand, and subrounded to angular pebbles and boulders of Paleozoic and Mesozoic sedimentary rocks, welded and water laid tuffs, and Tertiary sandstone and siltstone and minor limestone.

The poorly sorted older alluvial deposits also include fans, slopewash, talus, alluvium in washes, reworked ash, and windblown sands and silts, which are probably Pliocene through Miocene in age (Roberts and others, 1967; Ekren and others, 1972; Quinlivan and Rogers, 1974; Smith and Ketner, 1976; Regnier, 1960). Very coarse boulder conglomerates included with this unit along the south fork of the Owyhee River in the Mount Blitzen Quadrangle, probably represent reworked and transported glacial boulders (Coats, 1985). Estimates of thicknesses for older alluvial deposits range from a few hundred feet up to 2,000 feet.

Included with the Quaternary-Tertiary sediments on the geologic map are the undifferentiated Pliocene Panaca and Muddy Creek Formations in Lake, Spring, and White River Valleys (Westgate and Knopf, 1932; Phoenix, 1948; Maxey and Eakin, 1949).  In White River Valley, Tschanz and Pampeyan (1970) called correlative rocks the White River lakebeds. These units are white, pale gray-green, light brown, pink and reddish lacustrine sediments. Tuffaceous sandstones and water-lain tuffs predominate, but limestones, thin beds of diatomite, volcanic ash, and porcelaneous tuffs are locally present. The Panaca and Muddy Creek Formations are from a few hundred feet to nearly 1,500 feet thick (Ekren and others, 1977).

From 1,000 to 1,600 feet of fluvial and pond deposits of gravel, boulders, silt, sand, and tuff are present in Pine Valley. In the Carlin-Pinon Range area, these deposits are underlain by the Pliocene-Pleistocene Hay Ranch Formation that covers most the floor of Pine Valley. The Hay Ranch is described individually below.