Mount Logan is an 8,413-foot-elevation (2,564-meter) mountain

summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topography, topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used ...

located in Garfield County,

Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...

, United States. This peak is situated north of the community of De Beque, and northeast of Grand Junction.

Interstate 70 Interstate 70 (I-70) is a major east–west Interstate Highway System, Interstate Highway in the United States that runs from Interstate 15, I-15 near Cove Fort, Utah, to a park and ride lot just east of Interstate 695 (Maryland), I-695 in ...

traverses the southeast base of the mountain. Precipitation

runoff Runoff, run-off or RUNOFF may refer to: * RUNOFF, the first computer text-formatting program * Runoff or run-off, another name for bleed, printing that lies beyond the edges to which a printed sheet is trimmed * Runoff or run-off, a stock market ...

from this landform drains into the

Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid drainage basin, watershed that encompasses parts of ...

, and

topographic relief Terrain or relief (also topographical relief) involves the vertical and horizontal dimensions of land surface. The term bathymetry is used to describe underwater relief, while hypsometry studies terrain relative to sea level. The Latin word ...

is significant as the summit rises above the river in three miles (4.8 km). The mountain and surrounding area is controlled by the

Bureau of Land Management The Bureau of Land Management (BLM) is an agency within the United States Department of the Interior responsible for administering federal lands. Headquartered in Washington DC, and with oversight over , it governs one eighth of the country's la ...

. This landform's toponym has appeared in publications since at least 1913,US Geological Survey, ''Mineral Fuels'', 1913, U.S. Government Printing Office, p. 56 and has been officially adopted by the

U.S. Board on Geographic Names The United States Board on Geographic Names (BGN) is a federal body operating under the United States Secretary of the Interior. The purpose of the board is to establish and maintain uniform usage of geographic names throughout the federal govern ...

Climate

According to the

Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...

system, Mount Logan is located in a

semi-arid climate A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-ar ...

zone. Summers are hot and dry, while winters are cold with some snow. Temperatures reach on 5.3 days, on 57 days, and remain at or below freezing on 13 days annually.

Geology

Mount Logan is an erosional remnant of the

Roan Plateau The Roan Plateau is a plateau in western Colorado, USA, in Garfield County. It contains a variety of natural resources and scenic terrain: high ridges, deep valleys, desert lands, waterfalls, cutthroat trout, mountain lions, bears, rare plants, ...

. The mountain consists of

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

-age sedimentary rock, primarily

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...

and

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...

. The mountain is capped by

Uinta Formation The Uinta Formation is a Formation (geology), geologic formation in northeastern Utah. The name appears on a geologic map accompanying the Clarence King Fortieth Parallel report for 1876 but not defined until 1878 as the Uinta Group. As defined, ...

, and the slopes consist of the

Green River Formation The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-day Green River in Colorado, Wyoming, and Utah. The sediments are deposited in very fine ...

. A

Holocene The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togethe ...

-age landslide is conspicuous on the southeast slope.

Oil shale Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons can be produced. In addition to kerogen, general composition of oil shales constitute ...

was mined on the mountain in the 1920s by the Mount Logan Oil Shale Mining & Refining Company.Dean Eddy Winchester (1923), ''Oil Shale of the Rocky Mountain Region'', U.S. Government Printing Office, p. 74

Gallery

File:Landslide on Mt. Logan.jpg, Landslide on the south-southeastern face of Mt. Logan. The mountain is capped by

sedimentary rocks, and the slopes consist of the

(both Eocene in age). File:Landslide (Holocene; Mt. Logan, near Parachute, Colorado, USA).jpg,

-age landslide on Mt. Logan Mount Logan from California Zephyr.jpg, South aspect seen from California Zephyr File:De Beque, Colorado.JPG, Mount Logan visible from De Beque

References

External links

* Weather forecast
Mount Logan
* Mt. Logan (photo)
Flickr
* Mt. Logan (historical photo, circa 1920s)
Denverlibrary.org
{{DEFAULTSORT:Logan, Mount Colorado Plateau Landforms of Garfield County, Colorado North American 2000 m summits Sandstone formations of the United States Mountains of Colorado

Climate

Geology

Gallery

See also

References

External links