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Riochican
The Riochican ( es, Riochiquense) age is a period of geologic time (57.0–54.0 Ma) within the Paleocene and Eocene epochs of the Paleogene, used more specifically within the South American land mammal ages (SALMA). It follows the Peligran and precedes the Itaboraian age. Etymology This age is named after the Río Chico Group of the Golfo San Jorge Basin The Golfo San Jorge Basin ( es, Cuenca del Golfo San Jorge) is a hydrocarbon-rich sedimentary basin located in eastern Patagonia, Argentina. The basin covers the entire San Jorge Gulf and an inland area west of it, having one half located in San .... Formations Fossils References Bibliography ;Bogotá Formation * * * ;Bororó Formation * ;Chota Formation * * ;Las Flores Formation * ;Koluel Kaike Formation * ;Maíz Gordo Formation * ;Mealla Formation * ;Mogollón Formation * * ;Muñani Formation * ;Peñas Coloradas Formation * * ;Río Loro Formation * ;Salamanca Formation * * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mealla Formation
The Mealla Formation is a geological formation of the Santa Bárbara Subgroup, part of the Salta Group in the Salta Basin in northwestern Argentina whose strata date back to the Middle to Late Paleocene of the Paleogene. Description The Mealla Formation comprises sandstones ranging upward to siltstones with a basal conglomerate bed. The formation unconformably overlies the Yacoraite Formation and is overlain by the Thanetian Maíz Gordo Formation. The thickness of the formation ranges from .Narváez, 2009, p.22 The formation is the lowermost unit in the Santa Bárbara Subgroup, representing the post-rift phase of the Salta Basin. The Mealla Formation was deposited in a fluvial environment. Other parts of the formation contain freshwater stromatolites, interpreted as deposited in a shallow lacustrine environment.Narváez, 2009, p.23 The basal conglomerate is thick, matrix-supported with 80% of the clasts coming from quartzites from the Cambrian Mesón Group, with the rema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Río Loro Formation
The Río Loro Formation is a geological formation of the Sierras Pampeanas in Tucumán Province Argentina whose strata date back to the Late Paleocene of the Paleogene, or Riochican in the SALMA classification. The formation has been deposited in a meandering fluvial environment and has a maximum noted thickness of . The formation has provided fossils of several mammals and reptiles. The crocodylian genus ''Lorosuchus'' and mammal species '' Eoastrapostylops riolorense'' were named after the formation which is correlated with the Mealla Formation of the Salta Basin to the northwest of Tucumán Province. Description The Río Loro Formation crops out in the Sierra Medina, north of Tucumán city. The formation, first defined by Bossi in 1969,Babot et al., 2017, p.732 reaches a thickness of ,Georgieff, 2014, p.6 and comprises red sandstones and siltstones deposited in a fluvial meandering environment. The Río Loro Formation unconformably overlies the Cretaceous Los Blanquitos F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South American Land Mammal Age
The South American land mammal ages (SALMA) establish a geologic timescale for prehistoric South American fauna beginning 64.5 Mya (unit), Ma during the Paleocene and continuing through to the Late Pleistocene (0.011 Ma). These periods are referred to as ages, stages, or intervals and were established using geographic place names where fossil materials where obtained.Flynn & Swisher, 1995 The basic unit of measure is the first/last boundary statement. This shows that the first appearance event of one taxon is known to predate the last appearance event of another. If two taxa are found in the same fossil quarry or at the same stratigraphic horizon, then their age-range zones overlap. Background South America was an island continent for much of the Cenozoic, or the "Age of Mammals". As a result, its mammals evolved in their own unique directions, as Australia and Madagascar still have today. Paleogeographic timeline A simplified paleogeography, paleogeographic timeline of South ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etayoa
''Etayoa'' is an ungulate of the family Carodniidae in the order Xenungulata that lived during the Early Eocene (~ 55 Ma) in northern South America. Etymology The genus of the type species ''Etayoa bacatensis'' was named by palaeontologist Carlos Villarroel after Fernando Etayo Serna, who contributed extensively to the paleontology and stratigraphy research in Colombia. The species epithet ''bacatensis'' refers to Bacatá,Villarroel, 1987 the name in Muysccubun for the main settlement of the southern Muisca Confederation; the name of which has been used for the current Colombian capital Bogotá, founded in a different location than the original Bacatá. Description The type species fossil specimen consists of a partial mandible with teeth, found in the Bogotá Formation in the locality Ciudad Bolívar of Bogotá, Colombia.1987 Description of ''Etayoa bacatensis''- Paleobiology Database The estimated size of the ungulate is the size of a dog. 2011 Un xenungulado del Paleoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaboraian
The Itaboraian ( pt, Itaboraiense) age is a period within the Early Eocene geologic time (53.0–50.0 Mya (unit), Ma) epoch of the Paleogene, used more specifically with South American land mammal ages (SALMA). It follows the Riochican and precedes the Casamayoran age. Etymology This age is named after the Itaboraí Formation in the Itaboraí Basin in Itaboraí, a Rio de Janeiro metropolitan area, Greater Rio municipality in the state of Rio de Janeiro (state), Rio de Janeiro in Brazil not very far away from Niterói. Formations Fossils Correlations References Bibliography ;Itaboraí Formation * * * * * * ;Bogotá Formation * * * ;Cerrejón Formation * * * * * * * * * * * * * ;Chota Formation * * ;Las Flores Formation * * * ;Koluel Kaike Formation * ;Maíz Gordo Formation * ;Mogollón Formation * * ;Muñani Formation * ;Peñas Coloradas Formation * * ;Río Loro Formation * {{SALMA Itaboraian, Paleocene Sout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bogotá Formation
The Bogotá Formation ( es, Formación Bogotá, E1-2b, Tpb, Pgb) is a geological formation of the Eastern Hills and Bogotá savanna on the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly shale and siltstone formation, with sandstone beds intercalated, dates to the Paleogene period; Upper Paleocene to Lower Eocene epochs, with an age range of 61.66 to 52.5 Ma, spanning the Paleocene–Eocene Thermal Maximum. The thickness of the Bogotá Formation ranges from near Tunja to near Bogotá. Fossils of the ungulate '' Etayoa bacatensis'' have been found in the Bogotá Formation, as well as numerous reptiles, unnamed as of 2017. Etymology The formation was first described by Hettner in 1892,Acosta & Ulloa, 2002, p.59 then by Hubach in 1931, 1945 and 1957, and named in 1963 by Julivert after the Colombian capital Bogotá and its savanna.Montoya & Reyes, 2005, p.57 Description Lithologies The Bogotá Formation consists mainly of grayish-red ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golfo San Jorge Basin
The Golfo San Jorge Basin ( es, Cuenca del Golfo San Jorge) is a hydrocarbon-rich sedimentary basin located in eastern Patagonia, Argentina. The basin covers the entire San Jorge Gulf and an inland area west of it, having one half located in Santa Cruz Province, Argentina, Santa Cruz Province and the other in Chubut Province. The northern boundary of the basin is the North Patagonian Massif while the Deseado Massif forms the southern boundary of the basin. The basin has largely developed under condition of extensional tectonics, including rifting. The basin is of paleontological significance as it hosts six out of 22 defining formations for the South American land mammal age, SALMA classification, the geochronology for the Cenozoic used in South America. At the center of the basin accumulated sediments reach more than of thickness. Oil was first discovered in 1907 and over the years it has become the second most productive hydrocarbon basin in Argentina after Neuquén Basin. St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peligran
The Peligran ( es, Peligrense) age is a period of geologic time (62.5–59.0 Ma) within the Paleocene epoch of the Paleogene, used more specifically with South American land mammal ages (SALMA). It follows the Tiupampan and precedes the Riochican age. Etymology The age is named after the paleontological site Punta Peligro Punta is an Afro-indigenous dance and cultural music originating in the Caribbean Island of Saint Vincent And The Grenadines by the Garifuna people before being exiled from the island. Which is also known as Yurumei. It has African and Arawa ... in Argentina. Formations Fossils References Bibliography ;Peñas Coloradas Formation * * ;Bogotá Formation * * * ;Cerrejón Formation * * * * * * * * * * * * * ;Chota Formation * * ;Guaduas Formation * ;Salamanca Formation * * * * * ;Santa Lucía Formation * * * * * * * * * {{SALMA Paleocene South America Paleogene Argentina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sierras Pampeanas
The Sierras Pampeanas (also called Central Sierras or Pampas Sierras) (English: Pampas Mountains) is a geographical region of Argentina. The Sierras Pampeanas are a chain of mountains that rise sharply from the surrounding pampa region of Northwest Argentina. They run parallel to the Andes Mountains and their crest line is some east of the Andes crest line (running from 29° to 35° S latitude at about 65° W longitude). They cross into seven Argentina provinces: San Luis, San Juan, Córdoba, La Rioja, Catamarca, Santiago del Estero and Tucumán. Geography The highest point of the Sierras Pampeanas is Cerro General Belgrano (6250 m above sea level) in La Rioja, in the Sierra de Famatina. Between the mountain ranges are several salt-filled depressions. The Salinas Grandes depression is located in Cordoba, La Rioja, Catamarca and Santiago del Estero. A characteristic of many of these mountain ranges is their morphological asymmetry: the western slopes are usually ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salta Basin
Salta Basin or Salta Rift Basin is a sedimentary basin located in the Argentine Northwest. The basin started to accumulate sediments in the Early Cretaceous (Neocomian) and at present it has sedimentary deposits reaching thicknesses of . The basin contains seven sub-basins: Tres Cruces, Lomas de Olmedo, Metán, Alemanía, Salfity, El Rey, Sey and Brealito. The basin environment has variously been described as a " foreland rift" and an "intra-continental rift". The basin developed under conditions of extensional tectonics and rift-associated volcanism. Description The basin basement is composed of rocks belonging to the Puncoviscana Formation.Grier et al., 1991 The volcanism that began in the Late Jurassic was initially of subalkaline character (low sodium and potassium content), but turned increasingly alkaline in the Early Cretaceous.Marquillas et al., 2005 The rifts of Salta Basin developed in a time of generalized extensional tectonics along western South America.Ramos, 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salamanca Formation
The Salamanca Formation is a geologic formation in the Golfo San Jorge Basin of central Patagonia that yields well-preserved, well-dated fossils from the early Paleocene. Studies of these fossils are providing new data on plant and animal diversity following the Cretaceous–Paleogene extinction event, end-Cretaceous extinction event. Material was copied from this source, which is available under a creativecommons:by/4.0/, Creative Commons Attribution 4.0 International License The Salamanca Formation crops out in the San Jorge Basin in southern Chubut and northern Santa Cruz provinces, Argentina, overlying the Cretaceous Chubut Group and is part of the Paleocene and Eocene Río Chico Group. The formation yields abundant plant remains as well as fossils of Invertebrate, invertebrates, marine macrofaunas, Reptile, reptiles, and Mammal, mammals. The formation consists primarily of estuarine to shallow marine deposits. Palynological analysis of the Salamanca Formation shows low flora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peñas Coloradas Formation
Peñas is a location in the La Paz Department in Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p .... References {{DEFAULTSORT:Penas Populated places in La Paz Department (Bolivia) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
