The Lincoln Peak Formation is named for exposures along the south fork of Lincoln Canyon below the head of Johns Wash in the southern Snake Range (Drewes and Palmer, 1957)

The Lincoln Peak is Middle to Late Cambrian in age and is roughly equivalent to the interval represented by the Hamburg Dolomite and underlying Secret Canyon Shale, as well the Highland Peak Limestone, and parts of the Patterson Pass Shale and Emigrant Springs Limestone. The Lincoln Peak conformably overlies the Pole Canyon Limestone and underlies either the Dunderberg Shale or the Johns Wash Limestone in various exposures.

In the White Pine-Grant Range area, the Lincoln Peak is composed of alternating yellow and light orange weathering shales and thin-bedded blue-gray limestone (Moores and others, 1968). Lumsden (1964) described a lower member of alternating gray limestone and siltstone, and an upper member of alternating thin-bedded limestone and shale which weather to an orange-yellow color in the White Pine Range. In the Grant Range, the Lincoln Peak is represented by very thin-bedded, silty, gray and reddish or yellowish weathering silty limestone, with intercalated gray limestone and calcareous siltstone, and nodular bedded shale near the top of the formation (Cebull, 1970).

In the southern Snake Range, the Lincoln Peak is composed of gray to yellow-red brown weathering shaley limestone in beds about 2 inches in thickness and interbedded siliceous micaceous shale (Drewes, 1958). Whitebread (1969) described the formation in the southern Snake Range as dark gray limestone and shaley limestone with interbedded shale and calcareous shale. The basal portion of the formation is composed of red-purple shale and interbedded limestone.

In the central Schell Creek Range, the Lincoln Peak is composed of three members (Drewes, 1967). The lower shale member is composed of fissile to platy, silty and calcareous, olive-gray shale and scattered limestone beds 1 to 2 feet thick which compose about 10 percent of the member (Drewes, 1967). The middle limestone member is medium to dark gray, platy limestone with Girvanella, trilobites, and worm burrows. The upper shale member is composed of fissile to platy, olive gray to yellowish shale with interbedded bioclastic (trilobite hash) fine-grained limestone in 1 to 9 inch thick beds that make up 30 to 75 percent of the unit (Drewes, 1967).

In the southern Deep Creek Range, rocks correlated with the Lincoln Peak are composed of deformed, platy and thin-bedded, gray, highly fossiliferous and argillaceous limestone which weathers red, yellow or brown. These limestones are overlain by massive white dolomite (Nelson, 1959).

The Lincoln Peak is about 3,000 to 3,150 feet in the Grant- White Pine Range area (Lumsden, 1964; Moores and others, 1968), about 1,600 to 1,800 feet thick in the central Schell Creek Range, about 1,000 feet thick in the southern Snake Range where it is incomplete and 4,000 to 4,500 feet where complete (Drewes and Palmer, 1957; Whitebread, 1969), and about 500 feet thick in the southern Deep Creek Range (Nelson, 1959).

The Lincoln Peak Formation is described within the Grant, White Pine, Horse, southern Snake, central Schell Creek, and southern Deep Creek Ranges.

The details of depositional setting are poorly understood for the Lincoln Peak Formation. In general the Lincoln Peak appears to shallow upward from shales and shaley limestones to limestone containing Girvanella, worm burrows, and intraformational conglomerates indicating shallow marine shelf environments.