Víctor Alberto Ramos

Víctor Alberto Ramos (born 1945) is an Argentine geologist who has contributed to the paleogeography and plate tectonics of South America. He has been a member of the Chilean Academy of Science since 2001[1] and won in 2013 the Premio México de Ciencia y Tecnología.[2]

Ramos was the first to recognize the existence of Chilenia and the former sea that separated it from the rest of South America (then part of Gondwana). At the time of the discovery in the 1980s it was considered to be speculative.[3] In a 1988 conference in Chile the discovery of Chilenia was not well received and a payador at the conference ridiculed him.[4] As the existence of Chilenia was recognized, he was made a member of the Chilean Academy of Sciences.[3]

Together with other researchers Ramos has proposed to change the age of the Jurassic-Cretaceous boundary from 145 Ma to 140 Ma making the Jurassic longer. This proposal derives from a 2014 study based on biostratigraphy and radiometric dating of ash in the Vaca Muerta Formation in Neuquén Basin, Argentina.[5] In Ramos' words the study would serve as a "first step" toward formally changing the age in the International Union of Geological Sciences.[6]

Ramos has proposed that the Patagonian landmass originated as an allochtonous terrane that separated from Antarctica and docked in South America 250 to 270 Ma in the Permian period.[7] A 2014 study by Robert John Pankhurst and co-workers reject the idea of a far-travelled Patagonia claiming it is likely of parautochthonous (nearby) origin.[8]

Víctor Ramos has been a visiting professor at:

Víctor Ramos
NationalityArgentine
Alma materUniversity of Buenos Aires
Known forContributions to the geology of South America
AwardsPremio México de Ciencia y Tecnología (2013)
Scientific career
FieldsTectonostratigraphy, Tectonics, Paleogeography, Structural geology
InstitutionsUniversity of Buenos Aires

References

  1. ^ Miembros correspondientes extranjeros
  2. ^ Geólogo argentino Víctor Ramos gana el Premio México de Ciencia y Tecnología
  3. ^ a b Jaramillo, Jessica. "Entrevista al Dr. Víctor Alberto Ramos, Premio México Ciencia y Tecnología 2013" (in Spanish). Esto no fue bien recibido por la comunidad científica que lo consideró especulativo en su momento. Sin embargo, 25 años después, Ramos fue nombrado miembro de la Academia Chilena de Ciencias, precisamente por ese hallazgo..
  4. ^ "Desde la Ciencia I: Capítulo 1: Víctor Ramos". Youtube (in Spanish). 2012. Retrieved January 18, 2016.
  5. ^ Vennari, Verónica V.; Lescano, Marina; Naipauer, Maximiliano; Aguirre-Urreta, Beatriz; Concheyro, Andrea; Schaltegger, Urs; Armstrong, Richard; Pimentel, Marcio; Ramos, Victor A. (2014). "New constraints on the Jurassic–Cretaceous boundary in the High Andes using high-precision U–Pb data". Gondwana Research. 26: 374–385. doi:10.1016/j.gr.2013.07.005.
  6. ^ Jaramillo, Jessica. "Entrevista al Dr. Víctor Alberto Ramos, Premio México Ciencia y Tecnología 2013" (in Spanish). Si logramos publicar esos nuevos resultados, sería el primer paso para cambiar formalmente la edad del Jurásico-Cretácico. A partir de ahí, la Unión Internacional de la Ciencias Geológicas y la Comisión Internacional de Estratigrafía certificaría o no, depende de los resultados, ese cambio.
  7. ^ Jaramillo, Jessica. "Entrevista al Dr. Víctor Alberto Ramos, Premio México Ciencia y Tecnología 2013" (in Spanish). Incluso ahora continúa la discusión sobre el origen de la Patagonia, la cual lleva más de veinte años sin lograr un consenso entre la comunidad científica. Lo que propone el grupo de investigación en el que trabaja el geólogo es que la Patagonia se originó en el continente Antártico, para después separarse y formar parte de Gondwana, alrededor de 250 a 270 millones de años.
  8. ^ Pankhurst, R.J.; Rapela, C.W.; López de Luchi, M.G.; Rapalini, A.E.; Fanning, C.M.; Galindo, C. (2014). "The Gondwana connections of northern Patagonia" (PDF). Journal of the Geological Society, London. 171 (3): 313–328. doi:10.1144/jgs2013-081.
Cretaceous

The Cretaceous ( , kri-TAY-shəs) is a geologic period and system that spans from the end of the Jurassic Period 145 million years ago (mya) to the beginning of the Paleogene Period 66 mya. It is the last period of the Mesozoic Era, and the longest period of the Phanerozoic Eon. The Cretaceous Period is usually abbreviated K, for its German translation Kreide (chalk, creta in Latin).

The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds, as well as flowering plants, appeared.

The Cretaceous (along with the Mesozoic) ended with the Cretaceous–Paleogene extinction event, a large mass extinction in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous–Paleogene boundary (K–Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras.

Friasian

The Friasian age is a period of geologic time (16.3–15.5 Ma) within the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification of South America. It follows the Santacrucian and precedes the Colloncuran age.

Jurassic

The Jurassic Period (; from Jura Mountains) is a geologic period and system that spanned 56 million years from the end of the Triassic Period 201.3 million years ago (Mya) to the beginning of the Cretaceous Period 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period was marked by the major Triassic–Jurassic extinction event. Two other extinction events occurred during the period: the Pliensbachian-Toarcian extinction in the Early Jurassic, and the Tithonian event at the end; neither event ranks among the "Big Five" mass extinctions, however.

The Jurassic period is divided into three epochs: Early, Middle, and Late. Similarly, in stratigraphy, the Jurassic is divided into the Lower Jurassic, Middle Jurassic, and Upper Jurassic series of rock formations.

The Jurassic is named after the Jura Mountains within the European Alps, where limestone strata from the period were first identified.

By the beginning of the Jurassic, the supercontinent Pangaea had begun rifting into two landmasses: Laurasia to the north, and Gondwana to the south. This created more coastlines and shifted the continental climate from dry to humid, and many of the arid deserts of the Triassic were replaced by lush rainforests.

On land, the fauna transitioned from the Triassic fauna, dominated by both dinosauromorph and crocodylomorph archosaurs, to one dominated by dinosaurs alone. The first birds also appeared during the Jurassic, having evolved from a branch of theropod dinosaurs. Other major events include the appearance of the earliest lizards, and the evolution of therian mammals, including primitive placentals. Crocodilians made the transition from a terrestrial to an aquatic mode of life. The oceans were inhabited by marine reptiles such as ichthyosaurs and plesiosaurs, while pterosaurs were the dominant flying vertebrates.

Patagonia

Patagonia (Spanish pronunciation: [pataˈɣonja]) is a sparsely populated region at the southern end of South America, shared by Chile and Argentina. The region comprises the southern section of the Andes Mountains and the deserts, pampas, and grasslands to the east. Patagonia is one of the few regions with coasts on three oceans, with the Pacific Ocean to the west, the Atlantic Ocean to the east, and the Southern Ocean to the south.

The Colorado and Barrancas Rivers, which run from the Andes to the Atlantic, are commonly considered the northern limit of Argentine Patagonia. The archipelago of Tierra del Fuego is sometimes included as part of Patagonia. Most geographers and historians locate the northern limit of Chilean Patagonia at Huincul Fault, in Araucanía Region.

Premio México de Ciencia y Tecnología

Premio México de Ciencia y Tecnología is an award bestowed in by the CONACYT to Ibero-American (Latin America plus the Iberian Peninsula) scholars in recognition of advances in science and/or technology. In the selection of the recipients the work done on institutions located in Ibero-America is deemed particularly meriting.

Robert John Pankhurst

Robert John Pankhurst is a British geologist who has contributed to the study of the paleogeography and plate tectonics of South America. He has been a member of the Chilean Academy of Science since 2004.Robert Pankhurst has authored or co-authored of hundreds scientific papers since 1974 and is, as of 2017, a research associate at the British Geological Survey.

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.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.

Víctor Ramos

Víctor Ramos or Victor Ramos may refer to:

Víctor Alberto Ramos (born 1945), Argentine geologist

Víctor Rogelio Ramos (born 1958), retired Argentine football player

Victor Ramos (boxer) (born 1970), retired East Timorese boxer

Victor Ramos Ferreira (born 1989), Brazilian footballer

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