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El Peñón Formation
The El Peñón Formation ( es, Formación El Peñón, Kipe) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of calcareous shales and siltstones and dates to the Early Cretaceous period; Late Aptian epoch and has a measured thickness at its type section of . Ammonite fossils have been found in the formation, deposited in a shallow marine platform environment. Etymology The formation was defined and named in 1982 by Ulloa after El Peñón, Cundinamarca. Description Lithologies The El Peñón Formation has at is type section a thickness of , and is characterised by a sequence of calcareous shales and siltstones. The middle part of the sequence contains gypsum.Acosta & Ulloa, 2001, p.29 Fossils of the ammonites '' Cheloniceras sp.'' and '' Epicheloniceras sp. aff. carlosacostai'' have been found in the El Peñón Formation.Acosta & Ulloa, 2002, p.42 Stratigraphy and depositional environment The El Peñ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptian
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 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 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 Ma and lasted approximately 1 to 1.3 million years. The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma.Archangelsky, Sergio.The Ticó Flora (Patagonia) and the Aptian Extinction Event" ''Acta Paleobotanica'' 41(2), 2001, pp. 115-22. Stratigraphic definitions The Aptian was named after the small city of Apt in the Provence region of France, which is also known for its cry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD near Pomp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastern Hills, Bogotá
Eastern may refer to: Transportation *China Eastern Airlines, a current Chinese airline based in Shanghai * Eastern Air, former name of Zambia Skyways *Eastern Air Lines, a defunct American airline that operated from 1926 to 1991 *Eastern Air Lines (2015), an American airline that began operations in 2015 *Eastern Airlines, LLC, previously Dynamic International Airways, a U.S. airline founded in 2010 *Eastern Airways, an English/British regional airline *Eastern Provincial Airways, a defunct Canadian airline that operated from 1949 to 1986 *Eastern Railway (other), various railroads * Eastern Avenue (other), various roads *Eastern Parkway (other), various parkways *Eastern Freeway, Melbourne, Australia *Eastern Freeway Mumbai, Mumbai, India *, a cargo liner in service 1946-65 Education *Eastern University (other) * Eastern College (other) Other uses * Eastern Broadcasting Limited, former name of Maritime Broadcasting System, Canad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sasaima
Sasaima () is a municipality and town of Colombia in the department Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ... of Cundinamarca. The municipality was established in 1605 by Alonso Vasquez de Cisneros. The mayor is Gonzalo Parra Bohorquez. References Municipalities of Cundinamarca Department {{Cundinamarca-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Villeta, Cundinamarca
Villeta is a municipality and town in Cundinamarca (Colombia), located in Gualivá Province, approximately northwest of Bogota, considered the capital of the province. Its name means "Little Village". The municipality borders Quebradanegra and Nimaima in the north, Nocaima and Sasaima in the east, Albán and Vianí in the south and Guaduas in the west. It is situated at an altitude of in the Eastern Ranges of the Colombian Andes History The region of Villeta before the Spanish conquest was inhabited by the Panche. Modern Villeta was founded as Villa de San Miguel on September 29, 1551 by Alonso de Olalla and Hernando de Alcocer. Main economic activities in Villeta are related with sugar cane derivatives and as an important tourist center for people from Bogotá due to its warm climate, including ecologic trails, cascades and hotels. Geology The Villeta Group comprising the Conejo, La Frontera, Simijaca, Hiló, Capotes, Socotá, El Peñón and Trincheras Formati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guayabal De Síquima
Guayabal de Síquima also known as "The Golden Gate of the Central Magdalena" is a municipality and town of Colombia in the department of Cundinamarca located in the Central Magdalena Province 69 km from Bogotá. The principal town is located at 4°52’52” North and 74°28’10” West, in zone called Western Zone of the Eastern Mountains, which is characterized by sinuous mountains. Guayabal de Síquima is bordered on the northeast by the municipality of Villeta, on the west by the municipality of Bituima, on the north by Albán and on the south by Anolaima Anolaima () is a municipality and township of Colombia in the department of Cundinamarca. It is located in the providence of Tequendama at West from Bogotá in between the cities of Facatativá and La Mesa. Anolaima is known as the Fruit Capit .... History Guayabal de Síquima was founded in 1721 with the assignation of the Father Luis Calvo Vasallo as parish priest of the town. He began the construction of 22 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bituima
Bituima is a municipality and town of Colombia in the department Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ... of Cundinamarca. Municipalities of Cundinamarca Department {{Cundinamarca-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Locality (geology)
Type locality, also called type area, is the locality where a particular rock type, stratigraphic unit or mineral species is first identified. If the stratigraphic unit in a locality is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality. The term is similar to the term type site in archaeology or the term type specimen in biology. Examples of geological type localities Rocks and minerals * Aragonite: Molina de Aragón, Guadalajara, Spain * Autunite: Autun, France * Benmoreite: Ben More (Mull), Scotland * Blairmorite: Blairmore, Alberta, Canada * Boninite: Bonin Islands, Japan * Comendite: Comende, San Pietro Island, Sardinia * Cummingtonite: Cummington, Massachusetts * Dunite: Dun Mountain, New Zealand. * Essexite: Essex County, Massachusetts, US * Fayalite: Horta, Fayal Island, Azores, Portugal * Harzburgite: Bad Harzburg, Germany * Icelandite: Thingmuli (Þingmúli), Iceland * Ijolite: Iivaara, Kuusamo, Finl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depositional Environment
In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record. In most cases, the environments associated with particular rock types or associations of rock types can be matched to existing analogues. However, the further back in geological time sediments were deposited, the more likely that direct modern analogues are not available (e.g. banded iron formations). Types of depositional environments Continental * – type of Fluvial deposit. Caused by moving water in a fan shape (Alluvial Fan) and containing mostly impermeable and nonporous sediments well sorted. * . Often in deserts and coastal regions and well sorted, large scale cross-beds * – processes due to moving water, mainly streams. Common sediments are grav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shallow Marine
Shallow water marine environment refers to the area between the shore and deeper water, such as a reef wall or a shelf break. This environment is characterized by oceanic, geological and biological conditions, as described below. The water in this environment is shallow and clear, allowing the formation of different sedimentary structures, carbonate rocks, coral reefs, and allowing certain organisms to survive and become fossils. Sediment The sediment itself is often composed of limestone, which forms readily in shallow, warm calm waters. The shallow marine environments are not exclusively composed of siliciclastic or carbonaceous sediments. While they cannot always coexist, it is possible to have a shallow marine environment composed solely of carbonaceous sediment or one that is composed completely of siliciclastic sediment. Shallow water marine sediment is made up of larger grain sizes because smaller grains have been washed out to deeper water. Within sedimentary rocks compos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Socotá Formation
The Socotá Formation ( es, Formación Socotá, Kis) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of a lower unit of calcareous sandstones and an upper sequence of shales dates to the Early Cretaceous period; Late Aptian epoch and in Quipile has a measured thickness of with large regional variations. The formation hosts ammonite fossils. Etymology The formation was defined as a thicker sequence and named in 1969 by Cáceres and Etayo after Socotá, a vereda of Apulo, Cundinamarca. The name Socotá in Muysccubun, the language of the native Muisca, means either "Land of the Sun and farmfields" or "Good harvest". Description Lithologies The Socotá Formation has a maximum thickness of , and is characterised by a lower sequence of calcareous sandstones and an upper part of shales. Fossils of the ammonites '' Stoyanowiceras treffryanus'', '' Dufrenoyia sanctorum'', '' Parahoplites (?) hubachi'', and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
