Mount Jarvis is an eroded

shield volcano A shield volcano is a type of volcano named for its low profile, resembling a shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava ...

and

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

in the

Wrangell Mountains The Wrangell Mountains are a high mountain range of eastern Alaska in the United States. Much of the range is included in Wrangell-Saint Elias National Park and Preserve. The Wrangell Mountains are almost entirely volcanic in origin, and they i ...

of eastern

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

. It is located in Wrangell-Saint Elias National Park about east of the summit of Mount Wrangell. The mountain sits at the northeastern edge of the massive ice-covered shield of Wrangell, rising nearly above it in a spectacular series of cliffs and

icefall An icefall is a portion of certain glaciers characterized by relatively rapid flow and chaotic crevassed surface, caused in part by gravity. The term ''icefall'' is formed by analogy with the word ''waterfall'', which is a similar phenomenon of ...

s. When seen from above, Mount Jarvis is distinctly

dumbbell The dumbbell, a type of free weight, is a piece of equipment used in weight training. It is usually used individually and/or in pairs, with one in each hand. History The forerunner of the dumbbell, halteres, were used in ancient Greece as li ...

-shaped, with two prominent peaks connected by a narrower ridge. The mountain's main summit is , making it one of numerous

thirteener In mountaineering in the United States, a thirteener (abbreviated 13er) is a mountain that exceeds above mean sea level, similar to the more familiar "fourteeners," which exceed . In most instances, "thirteeners" refers only to those peaks betwe ...

s (peaks between 13,000 and 13,999 feet in elevation) in Alaska. The second summit is located about to the north-northwest, reaching with over of prominence above the connecting saddle, thus qualifying it as an independent peak on the list of thirteeners as well. The entire summit area including both peaks and the ridge is covered in glacial ice. The steep, rocky eastern and western faces of Mount Jarvis form

headwall In physical geography and geology, the headwall of a glacier, glacial cirque (landform), cirque is its highest cliff. The term has been more broadly used to describe similar geomorphic features of non-glacial origin consisting of a concave depress ...

s above the

cirques A (; from the Latin word ) is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from , meaning a pot or cauldron) and ; ). A cirque may also be a similarly shaped landform arising from fluvi ...

of the Jacksina Glacier and Copper Glacier, which flow northward out of the Wrangell Mountains. Mount Jarvis was named in 1903 by F. C. Schrader, a

USGS The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geograp ...

geologist, for Lt. David H. Jarvis of the U. S. Revenue Cutter Service, who led the Overland Relief Expedition to aid a whaling fleet trapped in

Arctic Ocean The Arctic Ocean is the smallest and shallowest of the world's five oceanic divisions. It spans an area of approximately and is the coldest of the world's oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, ...

ice off

Point Barrow Point Barrow or Nuvuk is a headland on the Arctic coast in the U.S. state of Alaska, northeast of Utqiagvik (formerly Barrow). It is the northernmost point of all the territory of the United States, at , south of the North Pole. (The northe ...

in 1897–98. __TOC__

References

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External links

* {{DEFAULTSORT:Jarvis, Mount Wrangell Mountains Shield volcanoes of the United States Subduction volcanoes Volcanoes of Alaska Landforms of Copper River Census Area, Alaska Jarvis Mountains of Unorganized Borough, Alaska Volcanoes of Unorganized Borough, Alaska Pleistocene shield volcanoes Pleistocene stratovolcanoes Stratovolcanoes of Alaska Stratovolcanoes with shield volcano characteristics

See also

References

External links