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Polaris Pass
Polaris Pass, Polaris Point or also Polaris Peak, is a mountain pass in the Wallowa Mountains in Oregon. It is one of the navigable ridges with the highest elevation within the Eagle Cap Wilderness. Polaris Pass is the drainage divide between the watersheds of the North Fork of the Imnaha River to the West Fork of the Wallowa River. It is located between the southern flanks of Pete's Point and the northern skirt of Sentinel Peak and is traversed by Polaris Trail #1831. Geology The geology of Polaris Pass is primarily formed of slate of the Hurwal Formation, with areas of Martin Bridge Limestone also present. These are constituted by dark and grey basalts that resemble more the strata in the Columbia River Gorge than to the distinctive slopes of marble and granite in most of the Wallowa–Whitman National Forest. Some of the basalt strata form pinnacles A pinnacle is an architectural element originally forming the cap or crown of a buttress or small turret, but afterwar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallowa County, Oregon
Wallowa County () is the northeastern most county in the U.S. state of Oregon. As of the 2020 census, the population was 7,391, making it Oregon's fifth-least populous county. Its county seat is Enterprise. According to '' Oregon Geographic Names'', the origins of the county's name are uncertain, with the most likely explanation being it is derived from the Nez Perce term for a structure of stakes (a weir) used in fishing. An alternative explanation is that ''Wallowa'' is derived from a Nez Perce word for "winding water". The journals of Lewis and Clark Expedition record the name of the Wallowa River as ''Wil-le-wah''. Wallowa County is part of the eight-county definition of Eastern Oregon. History In 1871, the first white settlers came to the area, crossing the mountains in search of livestock feed in the Wallowa Valley. The county was established on February 11, 1887, from the eastern portion of Union County. Boundary changes occurred with Union County in 1890, 1900, and 191 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurwal Formation
The Hurwal Formation is a geologic formation in Oregon. It preserves fossils dating back to the Triassic period. See also * List of fossiliferous stratigraphic units in Oregon * Paleontology in Oregon The location of the state of Oregon Paleontology in Oregon refers to paleontological research occurring within or conducted by people from the U.S. state of Oregon. Oregon's geologic record extends back approximately 400 million years ago to the ... References * Triassic geology of Oregon {{Triassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Passes Of Oregon
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (1,000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinnacle (geology)
A pinnacle, tower, spire, needle or natural tower (german: Felsnadel, ''Felsturm'' or ''Felszinne'') in geology is an individual column of rock, isolated from other rocks or groups of rocks, in the shape of a vertical shaft or spire. Examples are the summits of the Aiguille du Midi in the Mont Blanc massif in France, the almost 43-metre-high Barbarine on the south side of the Pfaffenstein hill near Königstein in Germany, or the Bischofsmütze, the Drei Zinnen and the Vajolet Towers in the Dolomites, which are rich in such towers. An area of limestone formations within Nambung National Park, near the town of Cervantes, Western Australia, is known as The Pinnacles. File:Cerro Torre.jpg, Cerro Torre 3,133 m (south flank ~2,150 m), Patagonia, Argentina/Chile File:Barbarine001.jpg, The Barbarine (43 m high), Saxon Switzerland, Germany File:Vajolett-Tuerme.jpg, The Vajolet Towers 2,790 m (main tower 120 m high), South Tyrol, Italy File:TH Phang Nga - Jame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallowa–Whitman National Forest
The Wallowa–Whitman National Forest is a United States National Forest in the U.S. states of Oregon and Idaho. Formed upon the merger of the Wallowa and Whitman national forests in 1954, it is located in the northeastern corner of the state, in Wallowa, Baker, Union, Grant, and Umatilla counties in Oregon, and includes small areas in Nez Perce and Idaho counties in Idaho. The forest is named for the Wallowa band of the Nez Perce people, who originally lived in the area, and Marcus and Narcissa Whitman, Presbyterian missionaries who settled just to the north in 1836. Forest headquarters are located in Baker City, Oregon with ranger districts in La Grande, Joseph and Baker City. Geography The national forest may be divided into several distinct sections, which together cover of land, including of designated wilderness. A large section of the forest is located in the rugged Wallowa Mountains, south of Joseph, Oregon, in the upper reaches of the Wallowa, Minam, and Imn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite
Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or ''granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. Granite is nearly alway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or Dolomite (mineral), dolomite. Marble is typically not Foliation (geology), foliated (layered), although there are exceptions. In geology, the term ''marble'' refers to metamorphosed limestone, but its use in stonemasonry more broadly encompasses unmetamorphosed limestone. Marble is commonly used for Marble sculpture, sculpture and as a building material. Etymology The word "marble" derives from the Ancient Greek (), from (), "crystalline rock, shining stone", perhaps from the verb (), "to flash, sparkle, gleam"; Robert S. P. Beekes, R. S. P. Beekes has suggested that a "Pre-Greek origin is probable". This Stem (linguistics), stem is also the ancestor of the English language, English word "marmoreal," meaning "marble-like." While the English term "marble" resembles the French language, French , most other European languages (with words like "marmoreal") more closely resemb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia River Gorge
The Columbia River Gorge is a canyon of the Columbia River in the Pacific Northwest of the United States. Up to deep, the canyon stretches for over as the river winds westward through the Cascade Range, forming the boundary between the state of Washington to the north and Oregon to the south. Extending roughly from the confluence of the Columbia with the Deschutes River (and the towns of Roosevelt, Washington, and Arlington, Oregon) in the east down to the eastern reaches of the Portland metropolitan area, the water gap furnishes the only navigable route through the Cascades and the only water connection between the Columbia Plateau and the Pacific Ocean. It is thus that the routes of Interstate 84, U.S. Route 30, Washington State Route 14, and railroad tracks on both sides run through the gorge. A popular recreational destination, the gorge holds federally protected status as the Columbia River Gorge National Scenic Area and is managed by the Columbia River Gorge Commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial planet, rocky planet or natural satellite, moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of volcanism on Venus, Venus, which cover ~80% of the surface, are basaltic; the lunar mare, lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Bridge Limestone
The Martin Bridge Formation is a geologic formation in Idaho. It preserves fossils dating back to the Triassic period. See also * List of fossiliferous stratigraphic units in Idaho * Paleontology in Idaho image:Map of USA ID.svg, The location of the U.S. state of Idaho Paleontology in Idaho refers to paleontological research occurring within or conducted by people from the U.S. state of Idaho. The fossil record of Idaho spans much of the geologic c ... References * Triassic Idaho Triassic geology of Oregon {{Triassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Mountaineers (club)
The Mountaineers is an alpine club in the US state of Washington. Founded in 1906, it is organized as an outdoor recreation, education, and conservation 501(c)(3) nonprofit organisation, and is based in Seattle, Washington. The club hosts a wide range of outdoor activities, primarily alpine mountain climbing and hikes. The club also hosts classes, training courses, and social events. The club runs a publishing business, Mountaineers Books, which has several imprints. Publications include '' Mountaineering: The Freedom of the Hills''. Organization and activities The Mountaineers has 7 branches in Western Washington, 3 mountain lodges, and 2 program centers, one in Magnuson Park in Seattle, and one in Tacoma. All classes and trips are organized. History Originally a Seattle-based part of the Mazamas, a Portland based group founded in 1894, The Mountaineers formed their own branch shortly after the 1906 Mazamas Mount Baker expedition and dubbed themselves "The Mountaineers" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Pass
A mountain pass is a navigable route through a mountain range or over a ridge. Since many of the world's mountain ranges have presented formidable barriers to travel, passes have played a key role in trade, war, and both Human migration, human and animal migration throughout history. At lower elevations it may be called a hill pass. A mountain pass is typically formed between two volcanic peaks or created by erosion from water or wind. Overview Mountain passes make use of a gap (landform), gap, saddle (landform), saddle, col or notch (landform), notch. A topographic saddle is analogous to the mathematical concept of a saddle surface, with a saddle point marking the highest point between two valleys and the lowest point along a ridge. On a topographic map, passes are characterized by contour lines with an hourglass shape, which indicates a low spot between two higher points. In the high mountains, a difference of between the summit and the mountain is defined as a mountain pas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
