The name Beacon Peak was applied to exposures which disconformably overlie the Lone Mountain Dolomite on the lower west slope of Beacon Peak in the Diamond Mountains (Nolan and others, 1956). The original designation is the Beacon Peak Dolomite Member of the Nevada Formation. The Beacon Peak Dolomite has been given formational status within the Antelope Range by Hose and others (1982).

The Beacon Peak is considered very latest Silurian to early Devonian in age. It is the litho-stratigraphic equivalent of the Sevy Dolomite exposed in the eastern portion of Nevada and western Utah.

The Beacon Peak Dolomite is a massive, light grey to brown, finely crystalline dolomite, with local thin beds of finely laminated dolomite, and thin lenses of well-rounded, quartz-rich, sandstones with a dolomitic matrix (Hose and others, 1982; Matti, 1979; Nolan and others, 1956). For a further discussion the reader is directed to the description of the Beacon Peak Dolomite Member under the Nevada Group above.

The Beacon Peak Formation is 328 feet where designated a formation in the Antelope Range. Other thickness data are given under the section of the Nevada Formation for Beacon Peak Dolomite Member of the Nevada Formation.

The Beacon Peak Dolomite has been given formational status in the Antelope Range by Hose and others (1982).

The Beacon Peak represents marine dolomite deposited in intertidal to supratidal shelf environments (Johnson and Murphy, 1984). Much of the Beacon Peak dolomite was deposited within supratidal mudflats and shallow ponds. Evaporite formation was prohibited by high rainfall and low evaporation rates, probably similar to the depositional setting of the Bahamian mud flats off Andros Island (Osmond, 1962; Hose and others, 1982).