|
Silver Bell Mountains
The Silver Bell Mountains are a northwest–southeast trending mountain range in north–central Pima County, Arizona. The range lies west of Marana, Arizona, located on Interstate-10, northwest of Tucson. The range is located to the east of the Ironwood Forest National Monument. Ragged Top, located in the north of the range, is a well-known landmark in this former mining region. Description The range is named after the Silver Bell Mine located at the southern end of the mountains. The range abuts the Waterman Mountains to the southeast, where palynology-(pollen) studies have shown some of the recent floristic history of Arizona during the Pliocene. Both ranges lie in the northeast Sonoran Desert; the Madrean Sky Island ranges begin just southeast of here, with the large, and most western sky island range, the Baboquivari Mountains-Quinlans 20–35 mi south. The Silver Bell range can be accessed by Avra Valley Road and Silver Bell Road from the south of Marana. Climat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ragged Top
Ragged Top is a mountain summit located within Ironwood Forest National Monument, in Pima County of southern Arizona. It is situated 35 miles northwest of Tucson, in the Silver Bell Mountains, where it rises over above the surrounding terrain as a landmark of the area. Ragged Top is the biological and geological crown jewel of the monument for sightseeing and wildlife viewing, such as the Desert bighorn sheep and the desert tortoise. Ragged Top contains the greatest richness of species within the Sonoran Desert, including 401 plant species. Cathestecum erectum (common name false grama) is only found on Ragged Top in the state of Arizona. Saguaro and ironwood forests cover the bajadas surrounding this mountain. This geographical feature lies within the Gila River drainage basin. Four small arches are located on this mountain.''Ironwood Forest National Monument Proposed Resource Management Plan and Final Environmental Impact Statement'', US Department of the Interior Bureau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palynology
Palynology is the "study of dust" (from grc-gre, παλύνω, palynō, "strew, sprinkle" and '' -logy'') or of "particles that are strewn". A classic palynologist analyses particulate samples collected from the air, from water, or from deposits including sediments of any age. The condition and identification of those particles, organic and inorganic, give the palynologist clues to the life, environment, and energetic conditions that produced them. The term is commonly used to refer to a subset of the discipline, which is defined as "the study of microscopic objects of macromolecular organic composition (i.e., compounds of carbon, hydrogen, nitrogen and oxygen), not capable of dissolution in hydrochloric or hydrofluoric acids". It is the science that studies contemporary and fossil palynomorphs (paleopalynology), including pollen, spores, orbicules, dinocysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter (POM) and kerogen found in sedimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Ranges Of The Sonoran Desert
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] |
List Of Mountain Ranges Of Arizona
There are 210 named mountain ranges in Arizona.This list also includes mountain ranges that are mostly in New Mexico and Sonora, Mexico, that extend into Arizona. Alphabetical list The southeast of Arizona, with New Mexico, northwest Chihuahua and northeast Sonora contain insular sky island mountain ranges, (the Madrean Sky Islands), or smaller subranges in association. There are also numerous Sonoran Desert ranges, or Arizona transition zone ranges. Northern and northeast Arizona also has scattered ranges throughout. #Agua Caliente Mountains–Yuma County and Maricopa County # Agua Dulce Mountains–Pima County # Aguila Mountains–Yuma County #Ajo Range–Pima County # Alvarez Mountains–Pima County # Aquarius Mountains–Mohave County # Artesa Mountains–Pima County #Artillery Mountains–Mohave County #Atascosa Mountains–Santa Cruz County #Aubrey Hills–Mohave County #''Baboquivari Mountains''–Pima Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Mountain Ranges Of Pima County, Arizona
A list of mountain ranges of Pima County, Arizona. Alphabetical list *Agua Dulce Mountains–Pima County * Ajo Range–Pima County * Alvarez Mountains–Pima County * Artesa Mountains–Pima County * Baboquivari Mountains (Arizona)–Pima County; See: Baboquivari Peak Wilderness * Batamote Mountains–Pima County * Bates Mountains–Pima County * Brownell Mountains–Pima County * Castle Mountains (Arizona)–Pima County *Cerro Colorado Mountains–Pima County * Cimarron Mountains–Pima County *Coyote Mountains (Arizona)–Pima County * Crooked Mountains–Pima County * Diablo Mountains (Arizona)–Pima County * Empire Mountains–Pima County * Gakolik Mountains–Pima County *Granite Mountains (Arizona)–Pima County–see also: Granite Mountain (Arizona)-(Yavapai County)a separate "Granite Mountain" is in s. La Paz County *Growler Mountains–Pima County * John the Baptist Mountains–Pima County * L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semi-arid Climate
A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-arid climates, depending on variables such as temperature, and they give rise to different biomes. Defining attributes of semi-arid climates A more precise definition is given by the Köppen climate classification, which treats steppe climates (''BSk'' and ''BSh'') as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential. Semi-arid climates tend to support short, thorny or scrubby vegetation and are usually dominated by either grasses or shrubs as it usually can't support forests. To determine if a location has a semi-arid climate, the precipitation threshold must first be determined. The method used to find the precipitation threshold (in millimeters): *multiply by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Köppen Climate Classification
The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notably in 1918 and 1936. Later, the climatologist Rudolf Geiger (1894–1981) introduced some changes to the classification system, which is thus sometimes called the Köppen–Geiger climate classification system. The Köppen climate classification divides climates into five main climate groups, with each group being divided based on seasonal precipitation and temperature patterns. 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'' indi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baboquivari Mountains
Baboquivari may refer to: * 2059 Baboquivari, a near-Earth asteroid * Baboquivari Peak Wilderness, a protected area in the U.S. state of Arizona * Baboquivari National Forest Baboquivari National Forest was established as the Baboquivari Forest Reserve by the U.S. Forest Service in Arizona on November 5, 1906, with . On March 4, 1907, it became a National Forest, and on July 1, 1908, the entire forest was combined wi ..., a former National Forest in the United States * Baboquivari High School, a high school in Sells, Arizona {{dab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sky Island
Sky islands are topographic isolation, isolated mountains surrounded by radically different lowland environments. The term originally referred to those found on the Mexican Plateau, and has extended to similarly isolated montane ecosystems, high-elevation forests. The isolation has significant implications for these natural habitats. The Southwestern United States, American Southwest region began warming up between and 10,000 years Before Present, BP and atmospheric temperatures increased substantially, resulting in the formation of vast deserts that isolated the sky islands. Endemism, altitudinal migration, and Relict (biology), relict populations are some of the natural phenomena to be found on sky islands. The complex dynamics of species richness on sky islands draws attention from the discipline of biogeography, and likewise the biodiversity is of concern to conservation biology. One of the key elements of a sky island is separation by physical distance from the other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madrean Sky Islands
The Madrean Sky Islands are enclaves of Madrean pine–oak woodlands, found at higher elevations in a complex of small mountain ranges in southern and southeastern Arizona, southwestern New Mexico, and northwestern Mexico. The sky islands are surrounded at lower elevations by the Sonoran and Chihuahuan deserts. The northern west–east perimeter of the sky island region merges into the higher elevation eastern Mogollon Rim and the White Mountains of eastern Arizona (southern Anasazi region). The sky islands are the northernmost of the Madrean pine–oak woodlands, and are classified as part of the Sierra Madre Occidental pine–oak forests ecoregion, of the tropical and subtropical coniferous forests biome. The sky islands were isolated from one another and from the pine–oak woodlands of the Sierra Madre Occidental to the south by the warming and drying of the climate since the ice ages. There are approximately 27 Madrean sky islands in the United States, and 15 in northern M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Neogene Period in the . The Pliocene follows the Epoch and is followed by the Epoch. Prior to the 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tucson, Arizona
, "(at the) base of the black ill , nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town" , image_map = , mapsize = 260px , map_caption = Interactive map outlining Tucson , image_map1 = File:Pima County Incorporated and Unincorporated areas Tucson highlighted.svg , mapsize1 = 250px , map_caption1 = Location within Pima County , pushpin_label = Tucson , pushpin_map = USA Arizona#USA , pushpin_map_caption = Location within Arizona##Location within the United States , subdivision_type = Country , subdivision_type1 = State , subdivision_type2 = County , subdivision_name = United States , subdivision_name1 = Arizona , subdivision_name2 = Pima , established_title = Founded , established_date = August 20, 1775 , established_title1 = Incorporated , e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
