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Erigeron Rhizomatus
''Erigeron rhizomatus'' is a rare species of flowering plant in the family Asteraceae known by the common names Zuni fleabane and rhizome fleabane. It is native to western New Mexico and eastern Arizona in the United States. It is a federally listed threatened species. ''Erigeron rhizomatus'' was thought to be a New Mexico endemic until 1999, when some plants were found over the border in Arizona.''Erigeron rhizomatus''. The Nature Conservancy. These are located in the on the , and they occur in 15 populations th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Cronquist
Arthur John Cronquist (March 19, 1919 – March 22, 1992) was an American biologist, botanist and a specialist on Compositae. He is considered one of the most influential botanists of the 20th century, largely due to his formulation of the Cronquist system as well as being the primary co-author to the Flora of the Pacific Northwest, still the most up to date flora for three northwest U.S. States to date. Two plant genera in the aster family have been named in his honor. These are ''Cronquistia'', a possible synonym of '' Carphochaete'', and ''Cronquistianthus'', which is sometimes included as a group within ''Eupatorium''. The former was applied by R.M. King and the latter by him and Harold E. Robinson. Life Arthur Cronquist was born on March 19, 1919, in San Jose, California, but he grew up outside of Portland, Oregon, as well as in Pocatello, Idaho. His parents divorced when he was young and he and his older sister were brought up by his mother, who worked for the Union ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Head (botany)
A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, composite flowers, or capitula, which are special types of inflorescences in which anything from a small cluster to hundreds or sometimes thousands of flowers are grouped together to form a single flower-like structure. Pseudanthia take various forms. The real flowers (the florets) are generally small and often greatly reduced, but the pseudanthium itself can sometimes be quite large (as in the heads of some varieties of sunflower). Pseudanthia are characteristic of the daisy and sunflower family (Asteraceae), whose flowers are differentiated into ray flowers and disk flowers, unique to this family. The disk flowers in the center of the pseudanthium are actinomorphic and the corolla is fused into a tube. Flowers on the periphery are zygomor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uranium Mining
Uranium mining is the process of extraction of uranium ore from the ground. Over 50 thousand tons of uranium were produced in 2019. Kazakhstan, Canada, and Australia were the top three uranium producers, respectively, and together account for 68% of world production. Other countries producing more than 1,000 tons per year included Namibia, Niger, Russia, Uzbekistan, the United States, and China. Nearly all of the world's mined uranium is used to power nuclear power plants. Historically uranium was also used in applications such as uranium glass or ferrouranium but those applications have declined due to the radioactivity of uranium and are nowadays mostly supplied with a plentiful cheap supply of depleted uranium which is also used in uranium ammunition. In addition to being cheaper, depleted uranium is also less radioactive due to a lower content of short-lived and than natural uranium. Uranium is mined by in-situ leaching (57% of world production) or by conventional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quercus Gambelii
''Quercus gambelii'', with the common name Gambel oak, is a deciduous small tree or large shrub that is widespread in the foothills and lower mountains of western North America. It is also regionally called scrub oak, oak brush, and white oak. The common and scientific names, Gambel oak and ''Quercus gambelii'', were named after the American naturalist William Gambel (1821–1849). Description ''Quercus gambelii'' trees differ in size from one location to another. The average mature height is from , but occasionally reaches heights of in some locations. Dwarf stands of plants under tall are common in marginal areas where heavy browsing occurs. The largest trees are found in the southern range of the species along streams. These trees reach up to 100 feet tall. The champion tree is in Arizona at tall. Although the wood is hard and dense, its branches are irregular and crooked, making them flexible enough to bend without breaking when covered with heavy snow. The bark ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colorado Pinyon
''Pinus edulis'', the Colorado pinyon, two-needle piñon, pinyon pine, or simply piñon, is a pine in the pinyon pine group whose ancestor was a member of the Madro-Tertiary Geoflora (a group of drought resistant trees) and is native to the United States. Distribution and habitat The range is in Colorado, southern Wyoming, eastern and central Utah, northern Arizona, New Mexico, western Oklahoma, southeastern California, and the Guadalupe Mountains in far western Texas. It occurs at moderate elevations of , rarely as low as and as high as . It is widespread and often abundant in this region, forming extensive open woodlands, usually mixed with junipers in the pinyon-juniper woodland plant community. The Colorado pinyon (piñon) grows as the dominant species on 4.8 million acres () in Colorado, making up 22% of the state's forests. The Colorado pinyon has cultural meaning to agriculture, as strong piñon wood "plow heads" were used to break soil for crop planting at the state's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juniperus Monosperma
''Juniperus monosperma'' is a species of juniper native to western North America, in the United States in Arizona, New Mexico, southern Colorado, western Oklahoma (Panhandle), and western Texas, and in Mexico in the extreme north of Chihuahua. It grows at 970–2300 m altitude.Farjon, A. (2005). ''Monograph of Cupressaceae and Sciadopitys''. Royal Botanic Gardens, Kew. Adams, R. P. (2004). ''Junipers of the World''. Trafford. It is an evergreen coniferous shrub or small tree growing to (rarely to 12 m) tall, usually multistemmed, and with a dense, rounded crown. The bark is gray-brown, exfoliating in thin longitudinal strips, exposing bright orange brown underneath. The ultimate shoots are 1.2–1.9 millimetres thick. The leaves are scale-like, 1–2 mm long and 0.6–1.5 mm broad on small shoots, up to 10 mm long on vigorous shoots; they are arranged in alternating whorls of three or opposite pairs. The juvenile leaves, produced on young seedlings only, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ericameria Nauseosa
''Ericameria nauseosa'' (formerly ''Chrysothamnus nauseosus''), commonly known as Chamisa, rubber rabbitbrush, and gray rabbitbrush, is a shrub in the sunflower family (Aster) found in the arid regions of western North America. Two subspecies have been described, ''consimilis'' (the green form with 8 varieties) and ''nauseosa'' (the gray form with 14 varieties).Completion of ''Ericameria'' (Asteraceae: Astereae): diminution of ''Chrysothamnus'' 1993 Phytologia 75: 74–93, G. L. Nesom, G.I. Baird. Description ''Ericameria nauseosa'' is a perennial shrub growing to .Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. p 198 The leaves, depending on the subspecies, are long and narrow to spatula-shaped. Both the flexible (rubbery) stems and the leaves are greenish-gray with a soft felt-like covering. It blooms from August to October [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercocarpus Montanus
''Cercocarpus montanus'' is a North American species of shrub or small tree in the family Rosaceae native to northern Mexico and the western United States. It is known by the common names alder-leaf mountain-mahogany, alder-leaf cercocarpus, and true mountain-mahogany. The variety ''argenteus'' is commonly known as silverleaf mountain-mahogany. Distribution ''Cercocarpus montanus'' is common in chaparral scrub, on mesas, the lower foothills of the Rocky Mountains, and the Great Plains in the United States. Its range extends from Montana, Idaho, and South Dakota south as far as Sonora, Durango, and Nuevo León. Description and ecology ''Cercocarpus montanus'' often remains under in height because of browsing by elk and deer, but can reach . It has thin and smooth bark. The species is considered to be long lived. It is also eaten by yellow-haired porcupine. File:Cercocarpus montanus 1.jpg, Flowers appear red when they first open File:Cercocarpus montanus 2.jpg, Flowers are ye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atriplex Canescens
''Atriplex canescens'' (or chamiso, chamiza, four-wing saltbush) is a species of evergreen shrub in the family Amaranthaceae native to the western and midwestern United States. Description ''Atriplex canescens'' has a highly variable form, and readily hybridizes with several other species in the genus ''Atriplex''. The degree of polyploidy also results in variations in form. Its height can vary from 1 foot to 10 feet, but 2 to 4 feet is most common. The leaves are thin and 0.5 to 2 inches long. It is most readily identified by the fruits, which have four wings at roughly 90 degree angles and are densely packed on long stems. This species blooms from April to October. Habitat Fourwing saltbush is most common in early succession areas such as disturbed sites and active sand dunes. It is also found in more mature successions dominated by sagebrush—''Artemisia tridentata'' and shadscale. Uses Among the Zuni people, an infusion of dried root and blossoms or a poultice of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinle Formation
The Chinle Formation is an Upper Triassic continental geological formation of fluvial, lacustrine, and palustrine to eolian deposits spread across the U.S. states of Nevada, Utah, northern Arizona, western New Mexico, and western Colorado. In New Mexico, it is often raised to the status of a geological group, the Chinle Group. Some authors have controversially considered the Chinle to be synonymous to the Dockum Group of eastern Colorado and New Mexico, western Texas, the Oklahoma panhandle, and southwestern Kansas. The Chinle Formation is part of the Colorado Plateau, Basin and Range, and the southern section of the Interior Plains.GEOLEX database entry for Chinle USGS (viewed 19 March 2006) A probable separate depositional basin within the Chinle is found in northwestern Colorado and northeastern U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baca Formation
The Baca Formation is a geologic formation in southern New Mexico and Arizona. It preserves fossils dating back to the Eocene period. Description The formation consists of coarse conglomerate, red and white sandstone, and red clay. Its total thickness is , of which is conglomerate. The formation rests unconformably on the Cretaceous Mesaverde Group and is overlain by the Oligocene Spears Formation. The formation was deposited in a basin that developed in Eocene time in eastern Arizona and west-central New Mexico. The basin was mostly a system of braided streams subject to frequent flash floods, with meandering streams restricted to the easternmost part of the basin. Paleocurrent directions showed that stream flow was generally to the east-northeast. Shallow floodplain lakes and a large, shallow closed lake in the eastern part of the basin were also present, though lacustrine beds are nearly absent due to extensive river delta formation. Deposition ended with the eruption o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually relate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saunders_Quarry-1.jpg "Click for more on -> Sandstone")