|
Simpsonotus
''Simpsonotus'' is an extinct genus of notoungulate mammals in the family Henricosborniidae from the Middle to Late Paleocene of South America. Fossils of the genus have been found in the Mealla Formation, a fluvial and lacustrine sedimentary unit of the Salta Basin in northwestern Argentina.Sánchez & Marquillas, 2009, p.389Narváez, 2009, p.172 The genus name honors paleontologist George Gaylord Simpson. Description ''Simpsonotus'' had a skull similar to ''Notostylops'', but with a shorter and rounder face. The genus contains two species; the type species ''S. praecursor'',''S. praecursor'' at .org and the double-sized ''S. major'', [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mealla Formation
The Mealla Formation is a geological Formation (geology), formation of the Santa Bárbara Subgroup, part of the Salta Group in the Salta Basin in Argentine Northwest, northwestern Argentina whose strata date back to the Selandian, Middle to Thanetian, Late Paleocene of the Paleogene. Description The Mealla Formation comprises sandstones ranging upward to siltstones with a basal conglomerate (geology), conglomerate bed. The formation unconformity (geology), 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 depositional environment, environment. Other parts of the formation contain freshwater stromatolites, interpreted as deposited in a shallow lacustrine environment.Narváez, 2009, p.23 The basal co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henricosborniidae
Henricosborniidae is a family of extinct notoungulate mammals known from the Late Paleocene to Middle Eocene of Argentina, Bolivia and Brazil. The name honors U.S. paleontologist Henry Fairfield Osborn. Description Henricosborniidae is a group of primitive notoungulates assigned to the suborder Notioprogonia together with Notostylopidae, not because these two families share any derived features, but because they do not clearly belong to any other clade. The henricosborniids are only known from the late Paleocene and early Eocene (Itaboraian-Casamayoran SALMA, ), making them slightly older and more primitive than the notostylopids. The henricosborniid dentition is the most generalized and primitive of all notoungulates, and they are believed to be near the source of all notoungulates. They have low teeth crowns and the dental formula . George Gaylord Simpson noted that many of the mammals that Ameghino had, and Simpson himself did, describe from the Río Chico Formation, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notoungulates
Notoungulata is an extinct order of mammalian ungulates that inhabited South America from the early Paleocene to the Holocene, living from approximately 61 million to 11,000 years ago. Notoungulates were morphologically diverse, with forms resembling animals as disparate as rabbits and rhinoceroses. Notoungulata are the largest group of South American native ungulates, with over 150 genera in 14 families having been described, divided into two major subgroupings, Typotheria and Toxodontia. Notoungulates first diversified during the Eocene. Their diversity declined during the Late Neogene, with only the large Toxodontidae, toxodontids persisting until the end of the Pleistocene. Collagen analysis suggests that notoungulates are closely related to Litopterna, litopterns, another group of South American ungulates, and their closest living relatives being Odd-toed ungulate, perissodactyls (odd-toed ungulates), including rhinoceroses, tapirs and Equus (genus), equines. but their relatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notoungulate
Notoungulata is an extinct order of mammalian ungulates that inhabited South America from the early Paleocene to the Holocene, living from approximately 61 million to 11,000 years ago. Notoungulates were morphologically diverse, with forms resembling animals as disparate as rabbits and rhinoceroses. Notoungulata are the largest group of South American native ungulates, with over 150 genera in 14 families having been described, divided into two major subgroupings, Typotheria and Toxodontia. Notoungulates first diversified during the Eocene. Their diversity declined during the Late Neogene, with only the large toxodontids persisting until the end of the Pleistocene. Collagen analysis suggests that notoungulates are closely related to litopterns, another group of South American ungulates, and their closest living relatives being perissodactyls (odd-toed ungulates), including rhinoceroses, tapirs and equines. but their relationships to other South American ungulates are uncertain. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaboraí Formation
The Itaboraí Formation ( pt, Formação Itaboraí) is a highly fossiliferous geologic formation and LagerstätteKellner & Campos, 1999, p.399 of the Itaboraí Basin in Rio de Janeiro, southeastern Brazil. The formation reaching a thickness of is the defining unit for the Itaboraian South American land mammal age (SALMA), dating to the Early Eocene, approximately 53 to 50 Ma. The formation is restricted to the Itaboraí Basin, a minibasin of around the city of Itaboraí, northeast of Rio de Janeiro, and comprises limestones, marls and lignites, deposited in an alluvial to lacustrine environment, dominated by heavy rainfall. The formation overlies Precambrian basement and is overlain by Early Eocene basalts and Late Eocene to Early Oligocene conglomerates. The up to thick formation has provided many fossil mammals of various groups among which the marsupials and related metatherians dominate, birds, snakes, crocodiles, amphibians, and several species of gastr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ypresian
In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene. Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. Stratigraphic definition The Ypresian Stage was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flemish city of Ypres in Belgium (spelled ''Ieper'' in Dutch). The definitions of the original stage were totally different from the modern ones. The Ypresian shares its name with the Belgian Ieper Group (French: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National University Of Salta
The National University of Salta ( es, Universidad Nacional de Salta, or UNSa) is an Argentine public national university in Salta. It was founded on 11 May 1972 as a part of the ''Plan Taquini'', a reorganization plan for education. It has around 20,000 students. Overview The university has regional headquarters in Tartagal and Orán. It has six subdivisions: Economic Sciences, Exacts Sciences, Natural Sciences, Humanities, Engineering and Health Science. The radio station "Radio Universidad Nacional de Salta" is based at UNSa. See also * Argentine Universities External links Official websiteSchool of Economic, Social and Law SciencesSchool of Natural ScienceSchool of Exact Science (Math)School of HumanitiesSchool of EngineeringSchool of Health ScienceLibrary of the School of Economic, Social and Law SciencesScience and Education in Argentina Salta Salta () is the capital and largest city in the Argentine province of the same name. With a population of 618,375 ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Revista De La Asociación Geológica Argentina
The ''Revista de la Asociación Geológica Argentina'' is an open access peer-reviewed scientific journal In academic publishing, a scientific journal is a periodical publication intended to further the progress of science, usually by reporting new research. Content Articles in scientific journals are mostly written by active scientists such ... published by the Asociación Geológica Argentina. The journal is released under a Creative Commons license, CC-BY-NC 2.5 license. - official website See also * ''Andean Geology'' * ''Boletín de Geología''References Geology journals Publications with year of establishment missing Geology of South America Multilingual journals Academic journals published by learned and professional soci ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ameghiniana
''Ameghiniana'' is a peer-reviewed scientific journal covering palaeontology published by the Asociación Paleontológica Argentina. It is named after the 19th century Italian Argentine palaeontologist Florentino Ameghino. The discovery of many dinosaurs found in Argentina and South America have first been published in ''Ameghiniana''; examples of this are ''Argentinosaurus'' and ''Herrerasaurus ''Herrerasaurus'' is a genus of saurischian dinosaur from the Late Triassic period. This genus was one of the earliest dinosaurs from the fossil record. Its name means "Herrera's lizard", after the rancher who discovered the first specimen in ...''. Abstracting and indexing The journal is abstracted and indexed in: References External links * Asociación Paleontológica Argentina Paleontology journals Geology of Argentina Publications established in 1957 Multilingual journals Quarterly journals Academic journals published by learned and professional societies of Arge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selandian
The Selandian is a stage in the Paleocene. It spans the time between . It is preceded by the Danian and followed by the Thanetian. Sometimes the Paleocene is subdivided in subepochs, in which the Selandian forms the "middle Paleocene". Stratigraphic definition The Selandian was introduced in scientific literature by Danish geologist Alfred Rosenkrantz in 1924. It is named after the Danish island of Zealand ( Danish: ''Sjælland'') given its prevalence there.Selandien The base of the Selandian is close to the boundary between |
Paleocene Mammals Of South America
The Paleocene, ( ) or Palaeocene, is a geological epoch that lasted from about 66 to 56 million years ago (mya). It is the first epoch of the Paleogene Period in the modern Cenozoic Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. In the Paleocene, the continents of the Northern Hemisphere were still connected via s ... [...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 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 paleogeographic timeline of South America: * 66 Ma – Sout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Selandian")
