Abstract
Near Currant, Nevada, the 10,000-foot thick Mio-Pliocene Horse Camp Formation (new name) disconformably overlies Oligo-Miocene volcanic rocks. It contains gravity-slide masses up to 1.5 miles long of Paleozoic sedimentary and Tertiary volcanic rocks. These masses interfinger with and grade into monolithic breccia and muddy boulder breccia. These tectonic deposits are added to a more normal Mio-Pliocene basin setting of lacustrine sediments, vitric ash, and volcanic-rich detrital deposits. Vitric ash deposits are partly altered to analcime and K-feldspar. The Horse Camp Formation contains four members, from bottom to top: Member 1 (2,000 feet thick) was deposited from the west; Member 2 (6,000 feet thick) from the north and south; and Members 3 and 4 (2,000 feet thick) from the east. This entire sedimentary complex records the development of local basin-range topography during Mio-Pliocene time and implies the contemporaneous existence of pronounced local relief and movement on low-angle faults in the source area.
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