West Elk Loop Scenic Byway
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The West Elk Mountains are a high mountain range in the west-central part of the
U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...
of
Colorado Colorado (, other variants) is a state in the Mountain states, 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 wes ...
. They lie primarily within the
Gunnison National Forest The Gunnison National Forest is a U.S. National Forest covering 1,672,136 acres (2,612.71 sq mi, or 6,766.89 km²) West Elk Wilderness The West Elk Wilderness is a U.S. Wilderness Area located northwest of Gunnison, Colorado in the West Elk Mountains The West Elk Mountains are a high mountain range in the west-central part of the U.S. state of Colorado. They lie primarily wit ...
. The range is primarily located in
Gunnison County Gunnison County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 16,918. The county seat is Gunnison. The county was named for John W. Gunnison, a United States Army officer and captain in the Army ...
, with small parts in eastern
Delta Delta commonly refers to: * Delta (letter) (Δ or δ), a letter of the Greek alphabet * River delta, at a river mouth * D ( NATO phonetic alphabet: "Delta") * Delta Air Lines, US * Delta variant of SARS-CoV-2 that causes COVID-19 Delta may also ...
and Montrose counties. The West Elks are surrounded by tributaries of the
Gunnison River The Gunnison River is located in western Colorado, United States and is one of the largest tributaries of the Colorado River. Description The river flows east to west and has a drainage area of according to the USGS. The drainage basin of ...
. The range is bounded on the north by the North Fork of the Gunnison and on the east by the
East River The East River is a saltwater tidal estuary in New York City. The waterway, which is actually not a river despite its name, connects Upper New York Bay on its south end to Long Island Sound on its north end. It separates the borough of Quee ...
, another tributary of the Gunnison. On the south and west it is contiguous with Black Mesa and Fruitland Mesa, both part of the uplift in which sits the
Black Canyon of the Gunnison Black Canyon of the Gunnison National Park is an American national park located in western Colorado and managed by the National Park Service. There are two primary entrances to the park: the south rim entrance is located east of Montrose, while ...
. On the northeast it is contiguous with the Elk Mountains, being separated from them by Anthracite Creek and Coal Creek. Nearby towns include Gunnison,
Paonia Paonia is a statutory town in Delta County, Colorado, United States. The population was 1,451 at the 2010 census. History The area was first explored in 1853 by Captain John W. Gunnison of the United States Army. Gunnison was on an expeditio ...
, and the
ski A ski is a narrow strip of semi-rigid material worn underfoot to glide over snow. Substantially longer than wide and characteristically employed in pairs, skis are attached to ski boots with ski bindings, with either a free, lockable, or partia ...
resort of
Crested Butte Crested Butte is a prominent mountain summit in the Elk Mountains range of the Rocky Mountains of North America. The peak is in Gunnison National Forest, northeast by east ( bearing 59°) of the Town of Crested Butte in Gunnison County, Col ...
.


Geology

The northern and southern West Elk Mountains have contrasting geologic histories and surface features. In the north, the prominent peaks are
laccolith A laccolith is a body of intrusive rock with a dome-shaped upper surface and a level base, fed by a conduit from below. A laccolith forms when magma (molten rock) rising through the Earth's crust begins to spread out horizontally, prying apar ...
s, formed when
magma Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural sa ...
intruded Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form '' intrusions'', such as batholiths, dikes, sills, laccoliths, and volcanic necks.Intrusive RocksIntrusive rocks accessdate: March 2 ...
into
Mancos Shale The Mancos Shale or Mancos Group is a Late Cretaceous (Upper Cretaceous) geologic formation of the Western United States. The Mancos Shale was first described by Cross and Purington in 1899 and was named for exposures near the town of Mancos, ...
about 30 million years go. Since then, the overlying
Mesozoic The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretace ...
sedimentary rock Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
, including the relatively soft Mancos Shale, has eroded away, exposing the laccoliths. Laccoliths in the West Elk Mountains include Marcellina Mountain, Mount Gunnison, East Beckwith Mountain, the Anthracite Range, Mount Axtell, Carbon Peak, and Whetstone Mountain. In contrast,
volcanic rock Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin. Like all rock types, the concept of volcanic ...
s dominate the southern portion of the range. Shortly after the laccolith intrusions in the north, volcanic activity began to the south. A large stratovolcano and other vents ejected material that accumulated over what is now the southern West Elk Mountains. Most of these volcanic rocks are included in the West Elk
Breccia Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of ...
Formation, a heterogeneous collection of volcanic materials including extensive
mudflow A mudflow or mud flow is a form of mass wasting involving fast-moving flow of debris that has become liquified by the addition of water. Such flows can move at speeds ranging from 3 meters/minute to 5 meters/second. Mudflows contain a significa ...
deposits. West Elk Breccia is in places over thick. On top of the West Elk Breccia,
volcanic ash Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to refer ...
was deposited through repeated eruptions in the
San Juan volcanic field The San Juan volcanic field is part of the San Juan Mountains in southwestern Colorado. It consists mainly of volcanic rocks that form the largest remnant of a major composite volcanic field that covered most of the southern Rocky Mountains in t ...
to the south. Most of the ash was deposited 26 to 27 million years ago. The resulting rock,
tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock ...
, is relatively soft, but the ash landing toward the southern edge of the West Elk volcanic field was hot enough to fuse into harder
welded tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock cont ...
. These welded tuffs are more resistant to weathering than the underlying breccia and today they cap multiple south-sloping mesas in the southern West Elk Mountains. Erosion has cut valleys and defined the mesas and peaks we see today. The highest point in the West Elk Mountains is West Elk Peak, which is located near the center of the large volcano that once dominated this landscape.
Stratigraphic Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostra ...
profiles of these rock layers can be seen at the southern edge of the West Elk Mountains where the
Gunnison River The Gunnison River is located in western Colorado, United States and is one of the largest tributaries of the Colorado River. Description The river flows east to west and has a drainage area of according to the USGS. The drainage basin of ...
has eroded through the volcanic strata. A good example can be seen at the Dillion Pinnacles in
Curecanti National Recreation Area Curecanti National Recreation Area(Pronounced (locally) or .) is a National Park Service unit located on the Gunnison River in western Colorado. Established in 1965, Curecanti National Recreation Area is responsible for developing and managing r ...
. The resistant welded tuff that caps Dillon Mesa is on top, overlying the West Elk Breccia, which has eroded into the pinnacles. Exposed under the breccia are the older, underlying Mesozoic sedimentary rocks including the
Mancos Mancos is a statutory town in Montezuma County, Colorado, United States. The population was 1,196 at the 2020 census, down from 1,336 in 2010. The town is in southwestern Colorado, at the base of Mesa Verde National Park, and holds the trademar ...
,
Dakota Dakota may refer to: * Dakota people, a sub-tribe of the Sioux ** Dakota language, their language Dakota may also refer to: Places United States * Dakota, Georgia, an unincorporated community * Dakota, Illinois, a town * Dakota, Minnesota, ...
, and
Morrison Morrison may refer to: People * Morrison (surname), people with the Scottish surname Morrison * Morrison Heady (1829–1915), American poet * Morrison Mann MacBride (1877–1938), Canadian merchant Places in the United States * Morrison, Colorad ...
Formations.


Prominent peaks


See also


References


External links


West Elk Mountains on peakbagger.comGeology of the Elk Mountains
*
West Elk Mountains on TopoQuestWest Elk Mountains Satellite Image on Google Maps
{{Colorado Mountains of Gunnison County, Colorado Mountains of Delta County, Colorado Mountains of Montrose County, Colorado Landforms of Gunnison County, Colorado Landforms of Delta County, Colorado Landforms of Montrose County, Colorado Gunnison National Forest Colorado Western Slope Mountain ranges of Colorado Ranges of the Rocky Mountains North American 3000 m summits