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Sierra Del Tontal
The Sierra del Tontal is a mountain range in the southern part of San Juan Province, Argentina. The range is in the precordillera area of La Rioja, San Juan and Mendoza, in the Cuyo region. It extends south of the Sierra del Tigre, from which it is separated by the valley of the San Juan River. Its southern foothills are located in Mendoza Province. The city of San Juan is located east of the mountains and the Calingasta valley to the west. The range extends for about in a northwest–southeast direction. The highest point is the Ojo de Agua mountain at . Most of the range extends to the south of this peak, and is over in elevation. The rocks include greywackes and shales. The fossil remains of plants that probably date to the middle or upper Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan Province, Argentina
San Juan Province () is a province of Argentina, located in the western part of the country. Neighbouring provinces are, moving clockwise from the north, La Rioja, San Luis and Mendoza. It borders with Chile to the west. The province has an area of 89,651 km2, covering a mountainous region with scarce vegetation, fertile oases and turbulent rivers. Throughout the entire province there are an important number of paleontological sites. Similar to other regions in Argentina, agriculture is one of the most important economic activities, highlighting wine production and olive oil. Additionally, a variety of fruits and vegetables are produced in the fertile valleys irrigated by artificial channels in the western part, close to the Andes mountain range. This is the second province in volume of wine production at the national level and in South America, and possesses outstanding varietal wines. It is also an important center of mining and oil production. History Before the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precordillera
Precordillera is a Spanish geographical term for hills and mountains lying before a greater range, foothills. The term is derived from ''cordillera'' (mountain range)—literally "pre-mountain range"—and applied usually to the Andes. Some places usually called precordillera are: *Andean mountains east of the main ranges of Andes in Argentina. It is separated from the much higher Frontal Cordillera to the west by Uspallata Valley in Argentina. Precordillera mountains reach around 3,000 m a.s.l. in Sierras de Villavicencio. *Used all over Chile from north to south as a morphological unit lying just between the Andes and the Intermediate Depression The Central Valley ( es, Valle Central), Intermediate Depression, or Longitudinal Valley is the depression between the Chilean Coastal Range and the Andes Mountains. The Chilean Central Valley extends from the border with Peru to Puerto Montt in .... See also * Geological history of the precordillera terrane * References {{Geo-te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Rioja Province, Argentina
La Rioja () is a province of Argentina located in the west of the country. The landscape of the province consist of a series of arid to semi-arid mountain ranges and agricultural valleys in between. It is in one of these valleys that the capital of the province, the city of la La Rioja, lies. Neighboring provinces are from the north clockwise Catamarca, Córdoba, San Luis and San Juan. The dinosaur '' Riojasaurus'' is named after the province. History Petroglyphs created by early indigenous peoples at the Talampaya National Park are dated around 10,000 years BC. Succeeding cultures of indigenous peoples developed here. The Diaguita, Capayan and the Olongasta peoples inhabited the territory of present-day La Rioja Province at the time of encounter with the Spanish colonists in the 16th century. Juan Ramírez de Velazco founded ''Todos Los Santos de la Nueva Rioja'' in 1591 under the government of Tucumán of the Viceroyalty of Peru. In 1630 the Calchaquí people revolted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mendoza Province
Mendoza, officially Province of Mendoza, is a province of Argentina, in the western central part of the country in the Cuyo region. It borders San Juan to the north, La Pampa and Neuquén to the south, San Luis to the east, and the republic of Chile to the west; the international limit is marked by the Andes mountain range. Its capital city is the homonymous city of Mendoza. Covering an area of 148,827 km2, it is the seventh biggest province of Argentina with 5.35% of the country's total area. The population for 2010 is 1,741,610 inhabitants, which makes it the fourth most populated province of the country, or 4.35% of the total national population. History Pre-Columbian times Archeological studies have determined that the first inhabitants in the area date from the Holocene, but there are few remains of those people to know their habits. The earliest sites of human occupation in Mendoza Province, Agua de la Cueva and Gruta del Indio, are 12,000–13,000 years old. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cuyo (Argentina)
Cuyo is the wine-producing, mountainous region of central-west Argentina. Historically it comprised the provinces of San Juan, San Luis and Mendoza. The modern New Cuyo includes both Cuyo proper and the province of La Rioja. New Cuyo is a political and economic macroregion, but culturally La Rioja is part of the North-West rather than of Cuyo. Cuyo has some of the most popular tourist attractions in Argentina and the highest mountain massifs in the Andes, including Aconcagua itself, the highest peak outside Asia, and the Ischigualasto Provincial Park. The soil is arid and reddish, crossed by few rivers. Most of the rivers are fed by the thawing of snow on the peaks, and their volume of water increases considerably in spring. The Desaguadero River is the main collector, receiving waters from the Bermejo, Vinchina and Salado before reaching the Colorado River. Viticulture is one of the main activities of the area. The wine production of the region represents almost 80% of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sierra Del Tigre
Sierra del Tigre is a mountain range in northeastern Sonora, Mexico at the northern region of the Sierra Madre Occidental. The region contains sky island mountain ranges, called the Madrean Sky Islands, some separated from the Sierra Madre Occidental proper, and occurring in the northeastern Sonoran Desert, and extreme west-northwestern Chihuahuan Desert. Many of the ranges occur in southeast Arizona. The Sierra del Tigre mountain range lies south of the San Bernardino Valley (Arizona) south of the Chiricahua Mountains; also the Swisshelm, Pedrogosa, and Perilla Mountains. The range is southeast of Douglas, Arizona-Agua Prieta, Sonora. Ecology Sierra del Tigre is located in the subregion of the Sonoran Desert called the ''Plains of Sonora'' along with some example mountain ranges, Sierra Mazatan, Sierra San Javier, and Cananea San Pedro. The threats include urbanization, land clearing, etc. The riparian protected wetland and grassland to the north in the San Bernardino Valley ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan River (Argentina)
The San Juan River is, together with the Jáchal, the most important river of the Argentine province of San Juan. Both join the Desaguadero/Colorado system that ends at the Atlantic Ocean. Course The river starts near the town of Calingasta, in the southwest of the province, from the confluence of three main rivers: the Calingasta River, the Castaño Viejo River, and the Río de los Patos. These rivers are born at an altitude of about above mean sea level in the west and southwest of the province (in contrast, the Jáchal receives its Andean tributaries from the north of the province). From Calingasta the river flows eastwards feeding the Los Caracoles, Punta Negra and Quebrada de Ullum Dams (''Embalse Quebrada de Ullum'') located near San Juan city, from which it continues south-eastwards receiving a few more tributaries, including the Mendoza River, to later join the Desaguadero River near the ''Salina Pampa de las Latas'' (or ''Salina Bermejo''), at the common bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan, Argentina
San Juan () is the capital and largest city of the Argentine province of San Juan in the Cuyo region, located in the Tulúm Valley, west of the San Juan River, at above mean sea level, with a population of around 112,000 as per the (over 500,000 in the metropolitan area). It is a modern city with wide streets and well-drawn avenues with wide sidewalks and vegetation of different species of trees irrigated by canals, from which it derives its nickname ''oasis town''. It has an important accommodation infrastructure and transportation. It highlights modern buildings and the surroundings, the reservoir and Ullum dam, spas, museums, large plantations of vines, and various types of agriculture, with wine being the most important. History and architecture Before the arrival of the Spanish Conquistadores, the Huarpe Indians inhabited this area. San Juan de la Frontera was founded on June 13, 1562, by Juan Jufré at the shore of the San Juan River. In 1593 flooding damaged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greywacke
Greywacke or graywacke (German ''grauwacke'', signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or lithic fragments set in a compact, clay-fine matrix. It is a texturally immature sedimentary rock generally found in Paleozoic strata. The larger grains can be sand- to gravel-sized, and matrix materials generally constitute more than 15% of the rock by volume. The term "greywacke" can be confusing, since it can refer to either the immature (rock fragment) aspect of the rock or its fine-grained (clay) component. The origin of greywacke was unknown until turbidity currents and turbidites were understood, since, according to the normal laws of sedimentation, gravel, sand and mud should not be laid down together. Geologists now attribute its formation to submarine avalanches or strong turbidity currents. These actions churn sediment and cause mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shale
Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.Blatt, Harvey and Robert J. Tracy (1996) ''Petrology: Igneous, Sedimentary and Metamorphic'', 2nd ed., Freeman, pp. 281–292 Shale is characterized by its tendency to split into thin layers ( laminae) less than one centimeter in thickness. This property is called '' fissility''. Shale is the most common sedimentary rock. The term ''shale'' is sometimes applied more broadly, as essentially a synonym for mudrock, rather than in the more narrow sense of clay-rich fissile mudrock. Texture Shale typically exhibits varying degrees of fissility. Because of the parallel orientation of clay mineral flakes in shale, it breaks into thin layers, often splintery and usually parallel to the otherwise indistinguishable beddin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Ranges Of Argentina
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 (topography), 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 Monadnock, isolated summits, but most occur in mountain ranges. Mountain formation, Mountains are formed through Tectonic plate, 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 Slump (geology), slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce Alpine climate, colder climates than at sea level at similar latitude. These colder climates strongly affect the Montane ecosystems, ecosys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
