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Santacrucian
The Santacrucian age is a period of geologic time (17.5 – 16.3 Mya (unit), Ma) within the Early Miocene epoch of the Neogene, used more specifically with South American land mammal age, 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 Magallanes Basin, Austral/Magallanes Basin of southern Patagonia, 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 Gualicho Formation * ;Jimol Formation * * * * * * * * ;Mariño Formation * * * * * ;Pinturas Formation * * ;RÃo Yuca Formation * {{SALMA Santacrucian, Miocene South America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Cruz Formation
The Santa Cruz Formation is a geological formation in the Magallanes/Austral Basin in southern Patagonia in Argentina and in adjacent areas of Chile. It dates to the late Early Miocene epoch, and is contemporaneous with eponymous Santacrucian SALMA. The formation extends from the Andes to the Atlantic coast. In its coastal section it is divided into two members, the lower, fossil rich Estancia La Costa Member, which has a lithology predominantly consisting of tuffaceous deposits and fine grained sedimentary claystone and mudstone, and the upper fossil-poor Estancia La Angelina Member, which consists of sedimentary rock, primarily claystone, mudstone, and sandstone. The environment of deposition is interpreted to have been mostly fluvial, with the lowermost part of the Estancia La Costa Member being transitional between fluvial and marine conditions. The environment of the Estancia La Costa Member is thought to have been relatively warm and humid, but likely became somewhat coole ... [...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] |
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] |
Jimol Formation
The Jimol Formation ( es, Formación Jimol, N1j) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira. The formation consists of calcareous lithic and fossiliferous sandstones, siltstones and mudstones. The Jimol Formation dates to the Neogene period; Burdigalian stage, Santacrucian in the SALMA classification, and has a maximum thickness of . Etymology The formation was defined by Renz in 1960 and named after Cerro Jimol.Moreno et al., 2015, p.7 Description Lithologies The Jimol Formation consists of calcareous lithic and fossiliferous sandstones, siltstones and mudstones.Moreno et al., 2015, pp.18-27 Stratigraphy and depositional environment The Jimol Formation overlies the Uitpa Formation and is overlain by the Castilletes Formation. The age has been estimated to be Early Miocene (17.9 to 16.7 Ma), corresponding to the Santacrucian in the SALMA classification. The invertebrate fauna of the Jimol Formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castillo Formation, Venezuela
The Castillo Formation is an Early Miocene (Burdigalian, Colhuehuapian to Santacrucian in the SALMA classification) geologic formation in the Falcón Basin of Venezuela. The formation unconformably overlies the Matatere, Misoa, El Paujà and Jarillal Formations.Urbani & Mendi, 2010, p.17 The Castillo Formation is overlain by Quaternary alluvium and in places by the Capadare Formation.Urbani & Mendi, 2010, p.19 The formation, deposited in a calm near-shore lagoonal brackish environment, with possibly fluvial influence, has provided a rich assemblage of fossil crocodylians, turtles, giant sloths and various types of fish. Description The Castillo Formation crops out cover a wide semicircular area that extends through the northwestern Venezuelan states of Falcón and Lara. During Oligocene to Miocene times, the formation formed the northwest to southeast edge of the Falcón Basin.Solórzano et al., 2018a, p.3 The formation, with a minimum thickness of ,Rincón et al., 2014, ... [...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 numero ... [...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] |
Colhuehuapian
The Colhuehuapian age is a period of geologic time (21.0–17.5 Ma) within the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Deseadan and precedes the Santacrucian age. Etymology The age is named after the Colhué Huapà Member of the Sarmiento Formation in the Golfo San Jorge Basin, 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 ;Colhué Huapà Member * * ;Abanico Formation * * * * * * ;Biblián Formation * ;Castillo Formation * * * * * ;Cerro Bandera Formation * * ;Chichinales Formation * * ;Chilcatay Formation * * * * * * * * * * ;Cura-MallÃn Group * * * ;Gaiman Formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 eas .... 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 Sout ... [...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, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Altiplano Basin
The Altiplano Basin ( es, Cuenca del Altiplano) is a sedimentary basin within the Andes in Bolivia and Peru. The basin is located on the Altiplano plateau between the Cordillera Occidental and the Cordillera Oriental. Over-all the basin has evolved through time in a context of horizontal shortening of Earth's crust. The great thickness of the sediments accumulated in the basin is mostly the result of the erosion of Cordillera Oriental. Description The Altiplano Basin has an approximate area of . The northern part of the basin is overridden by the Cordillera Occidental along the Pasani Fault, a thrust fault. To the east, the northern part of the basin was overridden by the Cordillera Oriental along the Ayaviri Fault, another thrust fault albeit the fault is now buried under more recent sediments. Further south near Oruro and Sica Sica the boundary of the basin with the Cordillera Oriental block is made up by the largely buried Coniri Fault. The fault contact is not reflected ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
