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La Quinta Formation
The La Quinta Formation is a Jurassic geologic formation which crops out in the Cordillera de Mérida and Serranía del Perijá of western Venezuela and northeastern Colombia. The formation is also present in the subsurface of the Cesar-Ranchería and Maracaibo Basins. At its type locality near La Grita, Táchira, it consists of a basal dacitic tuff followed by interlayered sandstones, tuffs, siltstones and rare limestones.Barret ''et al.'', 2008, p.164 Dinosaur remains including ''Laquintasaura'',Barret ''et al.'', 2014 '' Tachiraptor'', and '' Perijasaurus'' are among the fossils that have been recovered from the formation.Weishampel, ''et al.'' (2004). "Dinosaur distribution." Pp. 517-607 U–Pb zircon analysis demonstrates that the formation dates to 200.91+0.55 Ma at its base and a maximum age of 174.8 Ma. Paleofauna Regional correlations See also * List of dinosaur-bearing rock formations ** List of stratigraphic units with few dinosaur genera Notes Refer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Táchira
Táchira State ( es, Estado Táchira, ) is one of the 24 states of Venezuela. The state capital is San Cristóbal. Táchira State covers a total surface area of and as of the 2011 census, had a population of 1,168,908. At the end of the 19th century, Táchira State was where oil was discovered in Venezuela. Currently, its main economic revenues come from the production of coffee and pineapple. The cattle and agricultural activities play an important role in Táchira's economy. There is also a strong industrial sector which focuses on the processing of potato, sugar, milk, and cheese and the production of textiles. Táchira State is one of the three Venezuelan Andean states (the other two are Mérida and Trujillo). This state borders Zulia State to the north, Barinas and Mérida States to the east, Apure and Barinas States to the south, and Colombia (Norte de Santander Department) to the west. Etymology Possible origins have been identified for the word Táchira, so one ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Grita
La Grita is a town in the north west of Táchira state, Venezuela. It has a population of 80.000. Located in an Andean valley, La Grita has a beautiful natural setting and fertile land. The town includes colonial style houses and open plazas. The area offers visitors activities including hiking, camping, mountain climbing, as well as flora and fauna observation. Religious tourism is a main attraction during Semana Santa or during the celebration of the Santo Cristo de La Grita every August 6. History Founded by the Spanish Captain Francisco de Cáceres, in 1576, also known as ciudad de Atenas or ciudad del Espíritu Santo, it was the capital of the Province of La Grita (1576–1607). Later the town was a strategic point in Simon Bolivar's "Admirable Campaign" (1813). Bolivar stayed at the "Balcony House", now known as a site of great value to Venezuela's independence movement. La Grita was affected by the 1875 Cúcuta earthquake The 1875 Cúcuta earthquake (also known as e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proceedings Of The Royal Society B
''Proceedings of the Royal Society'' is the main research journal of the Royal Society. The journal began in 1831 and was split into two series in 1905: * Series A: for papers in physical sciences and mathematics. * Series B: for papers in life sciences. Many landmark scientific discoveries are published in the Proceedings, making it one of the most historically significant science journals. The journal contains several articles written by the most celebrated names in science, such as Paul Dirac, Werner Heisenberg, Ernest Rutherford, Erwin Schrödinger, William Lawrence Bragg, Lord Kelvin, J.J. Thomson, James Clerk Maxwell, Dorothy Hodgkin and Stephen Hawking. In 2004, the Royal Society began ''The Journal of the Royal Society Interface'' for papers at the interface of physical sciences and life sciences. History The journal began in 1831 as a compilation of abstracts of papers in the ''Philosophical Transactions of the Royal Society'', the older Royal Society publication ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Stratigraphic Units With Few Dinosaur Genera
This list of stratigraphic units with few non-avian dinosaur genera includes Mesozoic stratigraphic units of formation rank or higher that have produced dinosaur body fossils which have been referred to at most five genera. Since taxonomy frequently changes and can be somewhat subjective, the number of reported genera may not coincide exactly with the number of genera extant at the time of deposition. The list See also * List of dinosaur-bearing rock formations This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. Containing body fossils * List of stratigraphic units with dinosaur body fossils ** List of stratigraphic units with ... Footnotes References * Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. . {{DEFAULTSORT:List Of Stratigraphic Units With Few Dinosaur Genera Few dinosaur genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Dinosaur-bearing Rock Formations
This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. Containing body fossils * List of stratigraphic units with dinosaur body fossils ** List of stratigraphic units with few dinosaur genera ** List of stratigraphic units with indeterminate dinosaur fossils Containing trace fossils * List of stratigraphic units with dinosaur trace fossils ** List of stratigraphic units with dinosaur tracks *** List of stratigraphic units with ornithischian tracks *** List of stratigraphic units with sauropodomorph tracks *** List of stratigraphic units with theropod tracks See also * Lists of fossiliferous stratigraphic units * List of fossil sites * Mesozoic The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceo ... {{DEFAULTSOR ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cesar Department
Caesar Department ( es, Departamento del Cesar, links=no) or simply Caesar () is a department of Colombia located in the north of the country in the Caribbean region, bordering to the north with the Department of La Guajira, to the west with the Department of Magdalene and Department of Bolivar, to the south with Department of Santander, to the east with the Department of North Santander, and further to the east with the country of Venezuela (Zulia State). The department capital city is Valledupar. The region was first inhabited by indigenous peoples known as Euparis in the Valley of Upar and Guatapuris in the Valley of the Caesar river, among these were the Orejones pertaining to the Toupeh, Acanayutos pertaining to the Motilon and Alcoholades pertaining to the Chimila. The first European to explore the area was Spanish Captain Peter Vadillo, but German Ambrose Alfinger savagely conquered the region in 1532. From 1996–2006 paramilitary groups committed gross human right ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perijasaurus
''Perijasaurus'' (meaning "Perija lizard") is a genus of basal eusauropod sauropod dinosaur from the " Girón-type redbeds" of the La Quinta Formation of Cesar Department, north-eastern Colombia. The type species is ''Perijasaurus lapaz''. It lived during the Toarcian-Aalenian boundary around 175 million years ago early to middle Jurassic period. Discovery and naming The holotype, UCMP 37689, is a broken dorsal vertebra, around tall and centimeters long. It was discovered on 27 March 1943 at the western flank of the Serranía del Perijá mountain range by the Tropical Oil Company and was sent to the fossil collection at the University of California, Berkeley. Starting in 1955, UCMP 37689 had been mentioned in the literature with no consensus developing over its affinities. Eventually, the original site was rediscovered and the bone was prepared, allowing it to be named as a new genus and species, ''Perijasaurus lapaz'', in 2022. The generic name, "''Perijasaurus''", honors the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tachiraptor
''Tachiraptor'' ("thief of Táchira") is a genus of carnivorous Theropoda, theropod dinosaurs found in the early Jurassic period La Quinta Formation of Venezuela. It includes one species, ''Tachiraptor admirabilis'', described from a fossilized tibia and ischium. They were small bipedal dinosaurs, with a deduced total body length of just over . They were likely generalist species, generalist predators, preying on smaller vertebrates like other dinosaurs or lizards. Discovery Since the late 1980s in the Venezuelan state of Táchira, remains of dinosaurs have been uncovered at a road-cut between La Grita and Seboruco. Most of these belonged to a small herbivore that in 2014 was described as ''Laquintasaura''. However, included in the discoveries were some theropod teeth, indicating a predator must have been present. In 2013, this was affirmed by the discovery of some theropod bones. In 2014, the type species ''Tachiraptor admirabilis'' was named and described by Max Cardoso Lang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laquintasaura
''Laquintasaura'' is a genus of Venezuelan Ornithischia, ornithischian dinosaur containing only the type species ''Laquintasaura venezuelae''. The species was the first dinosaur to have been identified from Venezuela. It is known from extensive remains, all from a singular bonebed locality which has been sampled for specimen blocks over the course of several expeditions, largely led by Marcelo R Sánchez-Villagra. A small, very primitive animal, it is known for its distinct dental anatomy and for being one of the earliest and most primitive ornithischians in the fossil record. Taxonomic uncertainty has led to conflicting theories that it is either as the base of Ornithischia or at the base of the subgroup Thyreophora. In either model, its dating to around 200 million years ago, at the start of the Jurassic, existence in equatorial latitudes, and primitive nature make it a key view into early ornithischian evolution. It's thought that ''Laquintasaura'' would've lived in groups and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch, and are the only dinosaur lineage known to have survived the Cretaceous–Paleogene extinction event approximately 66 mya. Dinosaurs can therefore be divided into avian dinosaurs—birds—and the extinct non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are varied from taxonomic, morphological and ecological standpoints. Birds, at over 10,700 living species, are among ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siltstone
Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility.Blatt ''et al.'' 1980, pp.381-382 Although its permeability and porosity is relatively low, siltstone is sometimes a tight gas reservoir rock, an unconventional reservoir for natural gas that requires hydraulic fracturing for economic gas production. Siltstone was prized in ancient Egypt for manufacturing statuary and cosmetic palettes. The siltstone quarried at Wadi Hammamat was a hard, fine-grained siltstone that resisted flaking and was almost ideal for such uses. Description There is not complete agreement on the definition of siltstone. One definition is that siltstone is mudrock ( clastic sedimentary rock containing at least 50% clay and silt) in which at least 2/3 of the clay and silt fraction is composed of silt-sized particles. Silt is defined a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
