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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. Etymology The age is named after the RÃo FrÃas Formation in the Aysén Basin, Patagonia, Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a .... Formations Fossils References Bibliography ;RÃo FrÃas Formation * * * * * ;Castilletes Formation * * * * * * * * ;Cerdas Beds * ;Chilcatay Formation * * * * ;Cura-MallÃn Group * * * ;Gran Bajo del Gualicho Formation * ;Parángula Formation * ;Pebas Formation * * ;RÃo Foyel Formation * * ;RÃo Yuca Formation * {{SALMA Miocene S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RÃo FrÃas Formation
RÃo FrÃas Formation ( es, Formación RÃo FrÃas) is a Miocene, Middle Miocene geologic formation made up sedimentary rock located in Aysén Region, western Patagonia. The formation crops out along the upper couse of Cisnes River ( es, RÃo Cisnes).Marshall & Salinas, 1990 Marsupial fossils have been found in the formation.Marshall, 1990 The Friasian period in the South American Land Mammal Ages is named after the formation. Description RÃo FrÃas Formation was discovered by Santiago Roth in the summer of 1897–98. Roth was a Swiss immigrant who had been sent to survey the area by Francisco Moreno. Moreno was director of La Plata Museum and was involved in the Cordillera of the Andes Boundary Case 1902 (Argentina, Chile), Cordillera of the Andes Boundary Case between Chile and Argentina, thus there was both a political and scientific motivation behind the exploration of Patagonia. Santiago Roth called the upper course of RÃo Cisnes for RÃo FrÃas being unaware that it was t ... [...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] |
Magallanes Basin
The Magallanes Basin or Austral Basin is a major sedimentary basin in southern Patagonia. The basin covers a surface of about and has a NNW-SSE oriented shape. The basin is bounded to the west by the Andes mountains and is separated from the Malvinas Basin to the east by the RÃo Chico-Dungeness High. The basin evolved from being an extensional back-arc basin in the Mesozoic to being a compressional foreland basin in the Cenozoic. Rocks within the basin are Jurassic in age and include the Cerro Toro Formation. Three ages of the SALMA classification are defined in the basin; the Early Miocene Santacrucian from the Santa Cruz Formation and Friasian from the RÃo FrÃas Formation and the Pleistocene Ensenadan from the La Ensenada Formation. The Magallanes Basin contains most of Chile's coal reserves dwarfing those found in the Arauco Basin or around Valdivia (e.g. Catamutún, Mulpún). Its coals are lignitic to sub-bituminous. Stratigraphy Aysén Basin The northwesternmo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castilletes Formation
The Castilletes Formation ( es, Formación Castilletes, N1c) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira, Colombia. The formation consists of fossiliferous mudstones, siltstones and medium-grained to conglomeratic fossiliferous lithic to quartzitic sandstones. The Castilletes Formation dates to the Neogene period; Burdigalian to Langhian stages, Colloncuran and Friasian in the SALMA classification, and has a maximum thickness of . Etymology The formation was defined by Rollins in 1965 and named after the village of Castilletes.Moreno et al., 2015, p.27 Description Lithologies The Castilletes Formation consists of fossiliferous mudstones, siltstones and medium-grained to conglomeratic fossiliferous lithic to quartzitic sandstones.Moreno et al., 2015, pp.27-32 Stratigraphy and depositional environment The Castilletes Formation overlies the Jimol Formation and is overlain by the Ware Formation. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Borhyaena
''Borhyaena'' is an extinct genus of South American metatherian, living between 17.5 and 15.5 million years ago in Patagonia, Argentina ( Santa Cruz and Sarmiento Formations) and Chile ( RÃo Frias Formation).''Borhyaena'' at Fossilworks.org Description ''Borhyaena'' was a predator and had a large head and a long, powerful neck similar to living . Its legs were cursorial, albeit less specialized than those of |
Astrapotherium
''Astrapotherium'' ("lightning beast") is an extinct genus of South American mammals that vaguely resembled a small elephant or large tapir. However, it was unrelated to elephants or tapirs, but was instead related to other extinct South American ungulates. Fossils have been dated from the Early to Middle Miocene. Fossil remains of the type species ''A. magnus'' have been found in the Santa Cruz Formation in Argentina. Other fossils have been found in the Deseado, Sarmiento, and Aisol Formations of Argentina and Chile (Cura-MallÃn Group).''Astrapotherium'' at .org Description [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santacrucian
The Santacrucian age is a period of geologic time (17.5 – 16.3 Ma) within the Early Miocene epoch of the Neogene, used more specifically with SALMA classification in South America. It follows the Colhuehuapian and precedes the Friasian age. Etymology The age is named after the Santa Cruz Formation in the Austral/Magallanes Basin of southern Patagonia Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and gl ..., Argentina and Chile. Formations Fossils References Bibliography ;Santa Cruz Formation * * * * * * * * * * * * * * * * ;Aisol Formation * * ;Cantaure Formation * ;Castillo Formation * * * * * ;Cerro Boleadores Formation * ;Chaguaramas Formation * ;Chilcatay Formation * * * * ;Cura-MallÃn Group * * * ;Gran Bajo del Gualich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colloncuran
The Colloncuran ( es, Colloncurense) age is a period of geologic time (15.5–13.8 Ma) within the Middle Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Friasian and precedes the Laventan age. Etymology The age is named after the Collón Curá Formation in the Cañadón Asfalto and Neuquén Basins of northern Patagonia, Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th .... Formations Fossils References Bibliography ;Collón Curá Formation * * * * * * * * * * * * * * * * * * * * * * * * * * * ;Castilletes Formation * * * * * * * * ;Cura-MallÃn Group * * * ;Gran Bajo del Gualicho Formation * ;Nazareno Formation * * * * ;Pebas Formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cura-MallÃn Group
Cura-MallÃn Group ( es, Grupo Cura-MallÃn) is a heterogeneous group of volcano-sedimentary formations of Oligocene-Miocene age, Colhuehuapian to Laventan in the SALMA classification, in south-central Chile and nearby parts of Argentina.Pedroza et al., 2017 The sediments belonging to the group were deposited in a lacustrine environment and alongside rivers in an intra-arc basin.Suárez & Emparan, 1995 Southeast of Laguna del Laja Cura-MallÃn Group has a thickness of more than . The sediments making up the group deposited in an interval between 22 and 8 million years ago. The outcrops of Cura-MallÃn Group are found along a north-south elongate area. The group is considered an equivalent of Abanico Formation, either as a southern extension or as a lateral equivalent of that formation.Flynn et al., 2008 Stratigraphy and members Various subdivision schemes have been proposed for the Cura-MallÃn unit since the 1980s. In 1983, Niemeyer and Muñoz identified two members; the Rà ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colorado Basin, Argentina
The Colorado Basin ( es, Cuenca del Colorado) is a sedimentary basin located in northeastern Patagonia. The basin stretches across an area of approximately , of which onshore in the southern Buenos Aires Province and the easternmost RÃo Negro Province extending offshore in the South Atlantic Ocean. The basin comprises a sedimentary succession dating from the Permian (pre-rift stage) and Early Cretaceous (rift stage) to the Quaternary, representing the passive margin tectonic phase of the basin history. The Mesozoic rifting in the basin resulted from the break-up of Pangea and the formation of the South Atlantic. Long hiatuses exist in the succession. The basin is of paleontological significance for hosting fossiliferous stratigraphic units dating to the Late Miocene. The Arroyo Chasicó Formation defines the Chasicoan South American land mammal age and contains a rich mammal and other vertebrate fauna. The contemporaneous Cerro Azul Formation has provided fossil rodents, armad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cocinetas Basin
The Cocinetas Basin ( es, Cuenca Cocinetas) is a small sedimentary basin of approximately in northeasternmost Colombia. The onshore pull-apart basin is located in the department of La Guajira at the border with Zulia, Venezuela. The basin is bound by three sets of hills; the SerranÃa de Jarara, SerranÃa Macuira and SerranÃa Cocinas, with the eastern boundary formed by the Gulf of Venezuela, part of the Caribbean Sea. The basin was formed during the Paleogene as a result of the eastward movement of the Caribbean Plate along the northern edge of the South American Plate, leading to the deposition of a Middle Eocene to Middle Pleistocene sedimentary sequence of conglomerates, sandstones, siltstones, limestones and mudstones. In the Cocinetas Basin, several fossiliferous stratigraphic units have been registered, providing an abundance of marine and continental vertebrate and invertebrate fossil fauna assemblages. The Uitpa, Jimol, Castilletes and Ware Formations contain numerou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pebas Formation
The Pebas Formation is a lithostratigraphic unit of Miocene age, found in western Amazonia. The formation extends over , including parts of Brazil, Peru, Ecuador and Colombia.Wesselingh et al., 2006 It is interpreted as representing the deposits of a lake ("Lake Pebas") or series of lakes, formed within the foreland basin of the Andes mountain belt. It is known for its abundant fossil ostracods and molluscs and an unusually diverse group of crocodylians.Sala Gismondi et al., 2006 Fossil content Correlations Laventan Huayquerian References Bibliography * * * Further reading * {{cite LSA , first=P. , last=Antoine , first2=J.A. , last2=Abello , first3=S. , last3=Adnet , first4=A.J. , last4=Altamirano Sierra , first5=P. , last5=Baby , first6=G. , last6=Billet , first7=M. , last7=Boivin , first8=Y. , last8=Calderón , last9=Candela and J. Chabain, F. Corfu, D. A. Croft, M. Ganerød, C. Jaramillo, S. Klaus, L. Marivaux, R. E. Navarrete, M. J. Orliac, F. Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
