Stansbury Island

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Coordinates: 40°49′47″N 112°29′52″W / 40.82972°N 112.49778°W / 40.82972; -112.49778
Stansbury Island
View of Stansbury Island from southeast at Erda, Utah-(~20 mi)
Country United States
State Utah
Coordinates 40°49′47″N 112°29′52″W / 40.82972°N 112.49778°W / 40.82972; -112.49778
Highest point Castle Rock (Stansbury Island)
 - elevation 6,647 ft (2,026 m)

Stansbury Island is the second largest island within the Great Salt Lake in Utah, USA. Located in Tooele County, it is considered an island even though a dirt causeway connects it to the mainland. Stansbury Island was named after Howard Stansbury, the leader of a government expedition that surveyed the lake in 1849. Kit Carson and John Charles Fremont explored the island in 1843. Fremont named the island "Disappointment" and Carson carved a large cross on the mountain.[1]

A biking trail is located on the island. Petroglyphs and two caves large enough to explore are also located on the island. Its peak is Castle Rock, at 6647 feet above sea level. Camping is permitted in most areas.[2]

Geography and geology

Stansbury Island is longitudinally aligned and is approximately 11.5 miles (18.5 km) long, 4.5 miles (7.2 km) wide, and 22,314 acres (90.30 km2) in area.[3] The island is a desert mountain/mountain range, with a few fresh water seeps along the eastern side. The western side lacks water. The island is uninhabited and is used as a winter feeding ground for sheep. Average annual precipitation is approximately six inches.

The rocks on the island are mostly early Paleozoic in age. Precambrian strata are present at the north tip and along a portion of the northeast shore. The quartzite ledge on the southern part of the island is Devonian in age. The remaining northern third of the island dates back to the Cambrian Period, consisting of a small outcrop of Tintic Quartzite, but mainly middle Cambrian limestone, shale, and dolomite. The rest of the island is composed of Upper Cambrian to Upper Mississippian strata, mostly limestone, dolomite, quartzite, and shale.

The southern half of the island was folded into a southward anticline. The northern half of the island is composed of a series of northwesterly trending fault blocks in which the strata dip to the west. The faults in the north section are transverse and may have some strike–slip component.[4]

References

  1. ↑ Carson, K., Autobiography, 1935, Lincoln: University of Nebraska Press, ISBN 0803250312, p.76
  2. ↑ Horn, Matthew Van. "Stansbury Island - Castle Rock". Summit Post. Retrieved December 6, 2009. 
  3. ↑ Roylance, W.J., Utah: A Guide to the State, 1982, Salt Lake City: Zion Book Store, ISBN 0-91470-23-7, pp. 295 and 486
  4. ↑ Stokes, W.L., Geologic Setting of Great Salt Lake, in Great Salt Lake: A Scientific, Historical and Economic Overview, Gwynn, J.W., editor,1980, Utah Dept. of Natural Resources Utah Geological and Mineral Survey Bulletin 116, pp. 55-68

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