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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] |
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] |
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 related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caballos Formation
The Caballos Formation ( es, Formación Caballos, KI) is a geological formation of the Upper Magdalena Valley (VSM), Caguán-Putumayo Basin, Central and Eastern Ranges of the Colombian Andes. The sandstone and shale formation dates to the Middle Cretaceous period; Aptian to Albian epochs and has a maximum thickness of . Etymology The formation was defined and named in 1967 by Corrigan after Cerro Caballos, to the west of Olaya Herrera, Tolima.Velandia et al., 2001, p.53 Description Lithologies The Caballos Formation has a maximum thickness of in the Quebrada Bambucá and is characterized by a lower sequence of fine to coarse sandstones, of lithic arenite, quartz arenite and feldspar arenite composition, a middle section of fossiliferous black shales and siltstones, intercalated by micritic limestones and coals and very fine sandstones. The upper part of the formation contains conglomerates and glauconitic sandstones. Stratigraphy and depositional environment The C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoplites
''Acanthohoplites'' is an extinct genus of ammonites in the family Parahoplitidae that lived in the Aptian and Early Albian stages of the Early Cretaceous. Taxonomy The taxonomic position in the ''Treatise on Invertebrate Paleontology'' Pt L, 1957 placed the genus into the family Deshayesitidae. Newer classifications have revised that placement and the genus is now included into the family Parahoplitidae. '' Parahoplites'' and '' Hypacanthoplites'' are similar genera. Description These ammonites have a strongly ribbed shell and ammonitic suture. Early whorls are coronate, which later become round, then oval in section. Primary ribs may have swellings (bullae) at the umbilicus or are without. In early stages primary ribs branch mid flank at prominent lateral tubercles. In later stages lateral tubercles are reduced or absent and primary ribs branch simply at the umbilical shoulder or, again, mid flank. Sutural elements are subquadrate with narrow, shallow embayments. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dufrenoyia
''Dufrenoyia'' is an extinct genus of Cretaceous Ammonitida, ammonites included in the family Parahoplitidae. These fast-moving nektonic carnivores lived in the Cretaceous period (Aptian age).Sepkoski, JacSepkoski's Online Genus Database – Cephalopoda/ref> The type species of the genus is ''Ammonites dufrenoyi''. Species * ''Dufrenoyia codazziana'' Karsten, 1886 * ''Dufrenoyia dufrenoyi'' d'Orbigny, 1840 * ''Dufrenoyia furcata'' Sowerby, 1836 * ''Dufrenoyia justinae'' Hill, 1893 Distribution Fossils of species within this genus have been found in the Cretaceous sediments of Germany, Mexico, Morocco, Spain, the United Kingdom, United States, Colombia and Venezuela. References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L Ammonoidea. Geological Soc of America and University of Kansas press. Ammonitida genera Ancyloceratina Cretaceous ammonites Early Cretaceous ammonites of North America {{ammonitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muisca
The Muisca (also called Chibcha) are an indigenous people and culture of the Altiplano Cundiboyacense, Colombia, that formed the Muisca Confederation before the Spanish conquest. The people spoke Muysccubun, a language of the Chibchan language family, also called ''Muysca'' and ''Mosca''. They were encountered by conquistadors dispatched by the Spanish Empire in 1537 at the time of the conquest. Subgroupings of the Muisca were mostly identified by their allegiances to three great rulers: the ''hoa'', centered in Hunza, ruling a territory roughly covering modern southern and northeastern Boyacá and southern Santander; the '' psihipqua'', centered in Muyquytá and encompassing most of modern Cundinamarca, the western Llanos; and the '' iraca'', religious ruler of Suamox and modern northeastern Boyacá and southwestern Santander. The territory of the Muisca spanned an area of around from the north of Boyacá to the Sumapaz Páramo and from the summits to the western p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chibcha Language
Chibcha, Mosca, Muisca, Muysca (*/ˈmɨska/), or Muysca de Bogotá, was a language spoken by the Muisca people of the Muisca Confederation, one of the many Indigenous peoples in Colombia, indigenous List of pre-Columbian cultures, cultures of the Americas. The Muisca inhabited the Altiplano Cundiboyacense of what today is the country of Colombia. The name of the language ''Muysc Cubun'' in its own language means "language of the people", from ''muysca'' ("people") and ''cubun'' ("language" or "word"). Despite the disappearance of the language in the 17th century (approximately), several language revitalization processes are underway within the current Muisca communities. The Muisca people remain ethnically distinct and their communities are recognized by the Colombian state. Important List of Muisca scholars, scholars who have contributed to the knowledge of the Chibcha language include Juan de Castellanos, Bernardo de Lugo, José Domingo Duquesne and Ezequiel Uricoechea. His ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vereda
Vereda () is a subdivisional administrative part of a municipality in Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car .... Subdivisions of Colombia {{Colombia-geo-stub ... [...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] |
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