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Mount Allen (Alaska)
Mount Allen is a mountain summit in Alaska, United States. Description Mount Allen is a prominent glaciated mountain set in the Wrangell Mountains. The remote peak is located north-northwest of Chisana, Alaska, in Wrangell–St. Elias National Park and Preserve. Precipitation runoff from the mountain drains into tributaries of the Chisana River which is a tributary of the Tanana River. Topographic relief is significant as the summit rises 6,400 feet (1,950 m) above the Chisana River in five miles (8 km). Etymology The mountain is named for Henry Tureman Allen (1859–1930), who explored and mapped the Copper River region in 1885.Donald J. Orth, ''Dictionary of Alaska Place Names'', U.S. Government Printing Office, 1967, page 7. He named and measured the elevations of the region's giants such as Mount Blackburn, Mount Sanford, and Mount Drum. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Tureman Allen
Major General Henry Tureman Allen (April 13, 1859 – August 29, 1930) was a senior United States Army officer known for exploring the Copper River in Alaska in 1885 along with the Tanana and Koyukuk rivers by transversing of wilderness, an accomplishment which Nelson A. Miles compared to that of Lewis and Clark. Born in Sharpsburg, Kentucky, Allen graduated from West Point in 1882, and was commissioned as a second lieutenant of cavalry. He served on the staff of General Nelson A. Miles. He later served as a military attaché to Russia (1890–1895) and Germany (1897–1898). Allen also served in the Spanish–American War in the Battle of El Caney. He was then stationed to the Philippines to serve as military governor of Leyte in 1901. Eventually he organized and commanded the Philippine Constabulary, before going on in 1904 as an observer with the Japanese Army in Korea. During World War I, Allen was promoted to brigadier general and given command of the 90th Divisio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Blackburn
Mount Blackburn (Ahtna: ''K’ats’i Tl’aadi'') is the highest peak in the Wrangell Mountains of Alaska in the United States. It is the fifth-highest peak in the United States and the twelfth-highest peak in North America. The mountain is an old, eroded shield volcano, the second-highest volcano in the U.S. behind Mount Bona and the fifth-highest in North America. It was named in 1885 by Lt. Henry T. Allen of the U.S. Army after Joseph Clay Stiles Blackburn, a U.S. senator from Kentucky. It is located in the heart of Wrangell – St. Elias National Park, the largest national park in the country. Description The mountain's massif is covered almost entirely by icefields and glaciers and is the principal source of ice for the Kennicott Glacier, which flows southeast over to just above the town of McCarthy. The mountain also contributes a large volume of ice to the north-flowing Nabesna Glacier and the Kuskulana Glacier system. Mount Blackburn is a large, dramatic peak, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Copper River Census Area, Alaska
A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic (caused or influenced by human activity). Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great oceanic basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, structure stratification, rock exposure, and soil type. Gross physical features or landforms include intuitive elements such as berms, cliffs, hills, mounds, peninsulas, ridges, rivers, valleys, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Alaska
The geology of Alaska includes Precambrian igneous and metamorphic rocks formed in offshore terranes and added to the western margin of North America from the Paleozoic through modern times. The region was submerged for much of the Paleozoic and Mesozoic and formed extensive oil and gas reserves due to tectonic activity in the Arctic Ocean. Alaska was largely ice free during the Pleistocene, allowing humans to migrate into the Americas. Geologic History, Stratigraphy & Tectonics Compared with other areas of the North American continent, Alaska formed in the recent geologic past. Until 200 million years ago, western North America terminated at the Rocky Mountains, 120 miles further inland than the current shoreline, until the addition of the Yukon-Tanana Terrane. The Birch Creek Schist is the oldest rock in Alaska's interior and forms the core of the Yukon-Tanana Terrane with muscovite-quartz schist, mica quartzite and graphite schist. This intensely folded and rock unit extends f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Mountain Peaks Of Alaska
This article comprises three sortable tables of major mountain peaks of the U.S. State of Alaska. The summit of a mountain or hill may be measured in three principal ways: #The topographic elevation of a summit measures the height of the summit above a geodetic sea level. The first table below ranks the 100 highest major summits of Alaska by elevation. #The topographic prominence of a summit is a measure of how high the summit rises above its surroundings. The second table below ranks the 100 most prominent summits of Alaska. #The topographic isolation (or radius of dominance) of a summit measures how far the summit lies from its nearest point of equal elevation. The third table below ranks the 50 most isolated major summits of Alaska. __TOC__ Highest major summits Of the 100 highest major summits of Alaska, only Denali exceeds elevation, four peaks exceed , 23 peaks exceed , 61 peaks exceed , and 92 peaks exceed elevation. Five of these peaks lie on the internation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subarctic Climate
The subarctic climate (also called subpolar climate, or boreal climate) is a continental climate with long, cold (often very cold) winters, and short, warm to cool summers. It is found on large landmasses, often away from the moderating effects of an ocean, generally at latitudes from 50°N to 70°N, poleward of the humid continental climates. Like other Class D climates, they are rare in the Southern Hemisphere, only found at some isolated highland elevations. Subarctic or boreal climates are the source regions for the cold air that affects temperate latitudes to the south in winter. These climates represent Köppen climate classification ''Dfc'', ''Dwc'', ''Dsc'', ''Dfd'', ''Dwd'' and ''Dsd''. Description This type of climate offers some of the most extreme seasonal temperature variations found on the planet: in winter, temperatures can drop to below and in summer, the temperature may exceed . However, the summers are short; no more than three months of the year (but at least on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Köppen Climate Classification
The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (temperate), ''D'' (continental), and ''E'' (polar). Each group and subgroup is represented by a letter. All climates are assigned a main group (the first letter). All climates except for those in the ''E'' group are assigned a seasonal precipitation subgroup (the second letter). For example, ''Af'' indicates a tropical rainforest climate. The system assigns a temperature subgroup for all groups other than those in the ''A'' group, indicated by the third letter for climates in ''B'', ''C'', ''D'', and the second letter for climates in ''E''. Other examples include: ''Cfb'' indicating an oceanic climate with warm summers as indicated by the ending ''b.'', while ''Dwb'' indicates a semi-Monsoon continental climate, monsoonal continental climate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upper Tanana Language
Upper Tanana (also known as Tabesna, Nabesna or Nee'aanèegn') is an endangered Athabaskan language spoken in eastern Interior Alaska, United States, mainly in the villages of Northway, Tetlin, and Tok, and adjacent areas of the Canadian territory of Yukon. In 2000 there were fewer than 100 speakers, and the language was no longer being acquired by children. Overview Upper Tanana shows near mutual-intelligibility with neighboring Tanacross but differs in several phonological features. In particular, Upper Tanana has low tone as a reflex of Proto-Athabaskan constriction, where Tanacross has high tone. Upper Tanana also has an extra vowel phoneme and has developed diphthong A diphthong ( ), also known as a gliding vowel or a vowel glide, is a combination of two adjacent vowel sounds within the same syllable. Technically, a diphthong is a vowel with two different targets: that is, the tongue (and/or other parts of ...s through loss of final consonants. Traditionall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Drum
Mount Drum is a stratovolcano in the Wrangell Mountains of east-central Alaska in the United States. It is located at the extreme western end of the Wrangells, west-southwest of Mount Sanford and the same distance west-northwest of Mount Wrangell. It lies just inside the western boundary of Wrangell-Saint Elias National Park and Preserve and is east of the Copper River. Geography Standing near the low valley of the Copper River, Mount Drum is notable for its large local relief. For example, its south face rises over the head of the Nadina Glacier in only . Its west slopes rise over the tundra in only , and over the Copper River in only . These numbers are comparable to better-known stratovolcanoes like Mount Rainier and Mount Shasta. However Mount Drum is somewhat overshadowed by its much higher neighbor Mount Sanford, which is also in Alaska. Geology Mount Drum was active between 650,000 and 240,000 years ago. Late in that period, various separate dacitic dom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Sanford (Alaska)
Mount Sanford is a shield volcano in the Wrangell Volcanic Field, in eastern Alaska near the Copper River. It is the sixth highest mountain in the United States and the third highest volcano behind Mount Bona and Mount Blackburn. The south face of the volcano, at the head of the Sanford Glacier, rises in resulting in one of the steepest gradients in North America. Geology Mount Sanford is mainly composed of andesite, and is an ancient peak, being mostly Pleistocene, although some of the upper parts of the mountain may be Holocene. The mountain first began developing 900,000 years ago, when it began growing on top of three smaller shield volcanoes that had coalesced. Although obscured by icefields, the uppermost of the mountain appear to be a lava dome filling a larger summit crater. Two notable events in the mountain's history include a large rhyolite flow which traveled some to the north east of the peak and has a volume of about , and another flow which erupted fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Topographic Relief
Terrain (), alternatively relief or topographical relief, is the dimension and shape of a given surface of land. In physical geography, terrain is the lay of the land. This is usually expressed in terms of the elevation, slope, and orientation of terrain features. Terrain affects surface water flow and distribution. Over a large area, it can affect weather and climate patterns. Bathymetry is the study of underwater relief, while hypsometry studies terrain relative to sea level. Importance The understanding of terrain is critical for many reasons: * The terrain of a region largely determines its suitability for human settlement: flatter alluvial plains tend to have better farming soils than steeper, rockier uplands. * In terms of environmental quality, agriculture, hydrology and other interdisciplinary sciences; understanding the terrain of an area assists the understanding of watershed boundaries, drainage characteristics, drainage systems, groundwater systems, water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 include the second and third highest volcanoes in the United States, Mount Blackburn and Mount Sanford (Alaska), Mount Sanford. The range takes its name from Mount Wrangell, which is one of the largest andesite shield volcanoes in the world, and also the only presently active volcano in the range. The Wrangell Mountains comprise most of the Wrangell Volcanic Field, which also extends into the neighboring Saint Elias Mountains and the Yukon Territory in Canada. The Wrangell Mountains are just to the northwest of the Saint Elias Mountains and northeast of the Chugach Mountains, which are along the coast of the Gulf of Alaska. These ranges have the combined effect of blocking the inland areas from warmer moist air over the Pacific Ocean. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
