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Villeta Group
The Villeta Group () is a group (geology), geological group of the Cordillera Oriental (Colombia), Eastern Ranges of the Colombian Andes, to the west of the Altiplano Cundiboyacense. The group, a sequence of shales, limestones and sandstones, is subdivided into various formations; Conejo Formation, Conejo, La Frontera Formation, La Frontera, Simijaca Formation, Simijaca, Hiló Formation, Hiló, Pacho Formation, Pacho, Chiquinquirá Sandstone, Chiquinquirá, Capotes Formation, Capotes, Socotá Formation, Socotá, El Peñón Formation, El Peñón, and Trincheras Formation, Trincheras, and dates to the Cretaceous period; Aptian-Coniacian epochs. The group stretches out across four departments of Colombia, departments, from Huila Department, Huila in the south, through Cundinamarca Department, Cundinamarca and Boyacá Department, Boyacá to southern Santander Department, Santander in the north. The upper part of the Villeta Group is time-equivalent with the La Luna Formation of the Midd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptian
The Aptian is an age (geology), age in the geologic timescale or a stage (stratigraphy), stage in the stratigraphic column. It is a subdivision of the Early Cretaceous, Early or Lower Cretaceous epoch (geology), Epoch or series (stratigraphy), Series and encompasses the time from 121.4 ± 1.0 annum, Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous. The Aptian partly overlaps the upper part of the Western Europe, Western European Urgonian Stage. The Selli Event, also known as OAE1a, was one of two oceanic anoxic events in the Cretaceous Period, which occurred around 120 annum, Ma and lasted approximately 1 to 1.3 million years, being marked by enhanced silicate weathering, as well as ocean acidification. The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma. Stratigraphic definitions The Aptian was named after the small city o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trincheras Formation
The Trincheras Formation (, Kitr) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of a lower unit of calcareous shales and an upper sequence of shales dates to the Early Cretaceous period; Early Aptian epoch and has a maximum thickness of . The formation, deposited in a marine platform environment, part of a transgressive cycle, hosts ammonite, bryozoan, mollusc and echinoid fossils. Etymology The formation was defined and named in 1969 by Cáceres and Etayo after Quebrada Trincheras, Apulo, Cundinamarca.Acosta & Ulloa, 2002, p.39 Description Lithologies The Trincheras Formation has a maximum thickness of ,Acosta & Ulloa, 2001, p.23 and is characterised by a sequence of claystones with intercalated limestones and sandstones. Fossils of the ammonites '' Heinzia sp.'', '' Pseudohaploceras sp.'', '' Heminautilus etheringtoni'', '' Cheloniceras sp.'' and bryozoans, molluscs and echinoids have been f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar, because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand, sandstone may be imparted any color by impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topography, topographic features, certain colors of sandstone have become strongly identified with certain regions, such as the red rock deserts of Arches National Park and other areas of the Southwestern United States, American Southwest. Rock formations composed of sandstone usually allow the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group (geology)
In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into supergroups. Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of the area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group, which includes (in ascending order) the Wingate Sandstone, the Moenave Formation, the Kayenta Formation, and the Navajo Sandstone. Each of the formations can be distinguished from its neighbor by its lithology, but all were deposited in the same ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santander Department
Santander () is a department of Colombia. Santander inherited the name of one of the nine original states of the United States of Colombia. It is located in the central northern part of the country, borders the Magdalena River to the east, Boyacá to the south and southeast, the Norte de Santander Department to the northeast, the Cesar Department to the north, the Bolivar and Antioquia Departments to the west. Its capital is the city of Bucaramanga. History Pre-Columbian era Prior to the arrival of the Spaniards, the territory now known as Santander was inhabited by Amerindian ethnic groups: Muisca, Chitareros, Laches, Yariguí, Opón, Carare and Guanes. Their political and social structure was based on ''cacicazgos'', a federation of tribes led by a ''cacique'', with different social classes. Their main activity was planting maize, beans, yuca, arracacha, cotton, agave, tobacco, tomato, pineapple and guava, among others. Their agricultural skills were suffi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Huila Department
Huila () is one of the departments of Colombia. It is located in the southwest of the country, and its capital is Neiva. Demography and Ethnography Huila department had a population of 1,122,622 inhabitants in 2020, of which 679,667 (60.54%) live in urban areas and 442,955 (39.46%) in the rest of the ''Huilense'' territory. This amounts to 2.5% of the total Colombian population. The majority of it is settled in the Magdalena valley, the main urban centers being Neiva and Garzón, due to the possibilities offered by commercial-type agricultural economy, oil production, access to basic public services and roads connected to the central road axis along the Magdalena. The rest of the population is located on the coffee belt, standing out Pitalito and La Plata; the North Subregion is undergoing a decrease in its rural population, mainly attributable to alterations of agricultural and oil activities on the landscape. The average population density in the department is 59.88 inh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boyacá Department
Boyacá () is one of the thirty-two departments of Colombia, and the remnant of Boyacá State, one of the original nine states of the "United States of Colombia". Boyacá is centrally located within Colombia, almost entirely within the mountains of the Cordillera Oriental, Colombia, Eastern Cordillera to the border with Venezuela, although the western end of the department extends to the Magdalena River at the town of Puerto Boyacá, Boyacá, Puerto Boyacá. Boyacá borders to the north with the Department of Santander Department, Santander, to the northeast with the Bolivarian Republic of Venezuela and Norte de Santander, to the east with the departments of Arauca Department, Arauca and Casanare Department, Casanare. To the south, Boyacá borders the department of Cundinamarca Department, Cundinamarca and to the west with the Department of Antioquia Department, Antioquia covering a total area of . The capital of Boyacá is the city of Tunja. Boyacá is known as "The Land of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cundinamarca Department
Department of Cundinamarca (, ) is one of the departments of Colombia. Its area covers (not including the Capital District) and it has a population of 2,919,060 as of 2018. It was created on August 5, 1886, under the constitutional terms presented on the same year. Cundinamarca is located in the center of Colombia. Cundinamarca's capital city is Bogotá, the capital of Colombia. This is a special case among Colombian departments, since List of capitals outside the territories they serve, Bogotá is not legally a part of Cundinamarca, yet it is the only department that has its capital designated by the Colombian Constitution of 1991, Constitution (if the capital were to be ever moved, it would take a constitutional reform to do so, instead of a simple ordinance passed by the Cundinamarca Assembly). In censuses, the populations for Bogotá and Cundinamarca are tabulated separately; otherwise, Cundinamarca's population would total over 11 million. Etymology The name of Cundin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Von Humboldt
Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 1769 – 6 May 1859) was a German polymath, geographer, natural history, naturalist, List of explorers, explorer, and proponent of Romanticism, Romantic philosophy and Romanticism in science, science. He was the younger brother of the Prussian minister, philosopher, and linguistics, linguist Wilhelm von Humboldt (1767–1835). Humboldt's quantitative work on botany, botanical geography laid the foundation for the field of biogeography, while his advocacy of long-term systematic geophysical measurement pioneered modern Earth's magnetic field, geomagnetic and meteorology, meteorological monitoring. Humboldt and Carl Ritter are both regarded as the founders of modern geography as they established it as an independent scientific discipline. Between 1799 and 1804, Humboldt travelled extensively in the Americas, exploring and describing them for the first time from a non-Spanish European scientific point of view. His des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colombia
Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuela to the east and northeast, Brazil to the southeast, Peru and Ecuador to the south and southwest, the Pacific Ocean to the west, and Panama to the northwest. Colombia is divided into 32 Departments of Colombia, departments. The Capital District of Bogotá is also the List of cities in Colombia by population, country's largest city hosting the main financial and cultural hub. Other major urban areas include Medellín, Cali, Barranquilla, Cartagena, Colombia, Cartagena, Santa Marta, Cúcuta, Ibagué, Villavicencio and Bucaramanga. It covers an area of 1,141,748 square kilometers (440,831 sq mi) and has a population of around 52 million. Its rich cultural heritage—including language, religion, cuisine, and art—reflects its history as a co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andes
The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long and wide (widest between 18th parallel south, 18°S and 20th parallel south, 20°S latitude) and has an average height of about . The Andes extend from south to north through seven South American countries: Argentina, Chile, Bolivia, Peru, Ecuador, Colombia, and Venezuela. Along their length, the Andes are split into several ranges, separated by intermediate depression (geology), depressions. The Andes are the location of several high plateaus—some of which host major cities such as Quito, Bogotá, Cali, Arequipa, Medellín, Bucaramanga, Sucre, Mérida, Mérida, Mérida, El Alto, and La Paz. The Altiplano, Altiplano Plateau is the world's second highest after the Tibetan Plateau. These ranges are in turn grouped into three majo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cordillera Oriental (Colombia)
The Cordillera Oriental () is the widest of the three branches of the Colombian Andes. The range extends from south to north, dividing from the Colombian Massif in Huila Department to Norte de Santander Department where it splits into the Serranía del Perijá and the Cordillera de Mérida in Venezuelan Andes. The highest peak is Ritacuba Blanco at in the Sierra Nevada del Cocuy. Geography The western part of the Cordillera Oriental belongs to the Magdalena River basin, while the eastern part includes the river basins of the Amazon River, Orinoco River, and Catatumbo River. Within it, the Altiplano Cundiboyacense and the Sierra Nevada del Cocuy (with the only snowy peaks in this mountain range) stand out. The mountain range contains the most páramos in the world. The Cordillera Oriental montane forests ecoregion An ecoregion (ecological region) is an ecological and geographic area that exists on multiple different levels, defined by type, quality, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
