Uinta Mountains

Uinta Mountains

This view of Kings Peak and the Henry's Fork Basin shows the cliff bands and basins typical throughout the Uintas.
Highest point
Peak Kings Peak
Elevation 13,528 ft (4,123 m)
Coordinates 40°46′34″N 110°22′22″W / 40.776111°N 110.372778°W / 40.776111; -110.372778Coordinates: 40°46′34″N 110°22′22″W / 40.776111°N 110.372778°W / 40.776111; -110.372778
Geography
Country United States
States Utah and Wyoming
Parent range Rocky Mountains
Geology
Age of rock Precambrian
Type of rock quartzite, shale, and slate

The Uinta Mountains /juːˈɪntə/ are an east-west trending chain of mountains in northeastern Utah extending slightly into southern Wyoming in the United States. As a subrange of the Rocky Mountains, they are unusual for being the highest range in the contiguous United States running east to west,[1] and lie approximately 100 miles (160 km) east of Salt Lake City. The range has peaks ranging from 11,000–13,528 feet (3,353–4,123 m), with the highest point being Kings Peak, also the highest point in Utah. The Mirror Lake Highway crosses the western half of the Uintas on its way to Wyoming.

Geology

Hayden Peak and Mount Agassiz seen from Bald Mountain

The Uinta Mountains are Laramide uplifted metasedimentary rocks deposited in an intracratonic basin in southwest Laurentia during the time of the breakup of the supercontinent Rodinia. The marine and fluvial metasedimentary rocks in the core of the Uinta Mountains are of Neoproterozoic age[2] (between about 700 million and 800 million years old) and consist primarily of quartzite, slate, and shale. These rocks comprise the Uinta Mountain Group, and reach thicknesses of 4 to 7.3 kilometres (13,000 to 24,000 ft). Most of the high peaks are outcrops of the Uinta Mountain Group. Many of the peaks are ringed with bands of cliffs, rising to form broad or flat tops.[3] The mountains are bounded to the north and south by reverse faults that meet below the range, on the north by the North Flank fault and on the south by the Uinta Basin boundary fault.[4]

The Uinta Mountain Group from oldest to youngest includes Uinta Mountain unidivided quartz arenite, overlain by the Moosehorn Lake, Mount Watson, Hades Peak, and Red Shale formations.[5] The flanks of the east-west trending Uinta Mountains contain a sequence of Paleozoic and Mesozoic strata ranging from the Cambrian Lodore Formation to the Cretaceous Mancos Shale, all of which have been tilted during the uplift of the mountain range.

The uplift of the range dates to the Laramide orogeny, about 70 to 50 million years ago, when compressive forces produced high-angle reverse faults on both north and south sides of the present mountain range. The east-west orientation of the Uintas is anomalous compared to most of the ranges of the northern Rocky Mountains; it may relate to changing stress patterns and rotation of the Colorado Plateau.[6]

The high Uintas were extensively glaciated during the last ice age, and most of the large stream valleys on both the north and south sides of the range held long valley glaciers.[7] However, despite reaching to over 13,500 feet (4,110 m) in elevation, the climate today is sufficiently dry that no glaciers survived even before the rapid current glacial retreat began in the middle nineteenth century. The Uintas are the most poleward mountain range in the world to reach over 4,000 metres (13,000 ft) without modern glaciers, and are in fact the highest mountain range in the contiguous United States with no modern glaciers. Permafrost occurs at elevations above 10,000 feet (3,000 m)[8] and at times forms large rock glaciers.

In between the summits and ridgelines are wide, level basins, with some 500 small lakes. One of the most popular lakes is Mirror Lake because of its good fishing, scenic views, and easy road access.

Hydrology

Weber River

The south and east sides of the range are largely within the Colorado River watershed, including the Blacks Fork and the Duchesne River, which are tributaries of the Green River. The Green is the major tributary of the Colorado River and flows in a tight arc around the eastern side of the range. (Indeed John Wesley Powell said the Green was the "master stream" where it and the Colorado came together.)

The Bear and Weber rivers, the two largest tributaries of Great Salt Lake, are born on the west slope of the range. The Provo River, the largest tributary to Utah Lake, begins on the southern side of the range and flows west to Utah Lake, which itself drains via the Jordan River into Great Salt Lake.

Large portions of the mountain range receive over 40 inches (100 cm) of precipitation annually.[9] The high Uintas are snowcapped year-round except for late July through early September. The Uinta Mountains have more than 400 miles (640 km) of streams and 1,000 lakes and ponds.[10]

Ecology

Gilbert Peak seen from lake 151

The Uinta Mountains are part of the Wasatch and Uinta montane forests ecoregion. Nearly the entire range lies within Wasatch-Cache National Forest (on the north and west) and Ashley National Forest (on the south and east). The highest peaks of the range are protected as part of the High Uintas Wilderness. The forests contain many species of trees, including lodgepole pine, subalpine fir, Engelmann Spruce, Douglas-fir, and Quaking aspen. There are also many species of grasses, shrubs, and forbs growing in the Uinta Mountains.

Points of interest

The Uintas is home to Camp Steiner, the highest Boy Scout camp in the United States at 10,400 feet (3,200 m). The camp is near mile marker 33 of the Mirror Lake Highway.

The Uinta Highline Trail traverses the entire range and is a popular backpacking trail.

Dinosaur National Monument is located on the southeast flank of the Uinta Mountains on the border between Colorado and Utah.

See also

References

  1. ↑ "Kings Peak, Utah". Peakbagger.com. Retrieved 2008-02-23.
  2. ↑ Paleomagnetic results from the Neoproterozoic Uinta Mountain Group
  3. ↑ John McPhee, Basin and Range, New York: Farrar, Straus, and Giroux, 1981, pp.198-199.
  4. ↑ Nelson, S. T.; Keith, J. D.; Constenius, K. N.; Olcott, J.; Duerichen, E.; Tingey, D. G. (1 May 2008). "Genesis of fibrous calcite and emerald by amagmatic processes in the southwestern Uinta Mountains, Utah". Rocky Mountain Geology 43 (1): 1–21. doi:10.2113/gsrocky.43.1.1.
  5. ↑ Condie, Kent C.; Dennis Lee; G. Lang Farmer (2001). "Tectonic setting and provenance of the Neoproterozoic Uinta Mountain and Big Cottonwood groups, northern Utah: constraints from geochemistry, Nd isotopes, and destrital modes". Sedimentary Geology. 141-142: 443–464. doi:10.1016/s0037-0738(01)00086-0.
  6. ↑ Hamilton, W.B., 1981, Plate-tectonic mechanism of Laramide deformation, in Boyd, D.W., and Lillegraven, J.A., eds., Rocky Mountain foreland basement tectonics: University of Wyoming Contributions to Geology, v. 19, p. 87–92.
  7. ↑ Utah Geological Survey. "Are there glaciers in Utah’s mountains?". Retrieved 2008-04-11.
  8. ↑ Glacial Geology of the Northern Uinta Mountains
  9. ↑ WRCC.dri.edu
  10. ↑ Probst, Jeffrey, and Probst, Brad, Hiking Utah's High Uintas, pg. 3, Morris Book Publishing, LLC, 2006 ISBN 0-7627-3911-8

Further reading

External links

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