[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/silurian-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/silurian-wikipedia\/","headline":"Silurian – Wikipedia","name":"Silurian – Wikipedia","description":"before-content-x4 Third period of the Paleozoic Era 443-419 million years ago after-content-x4 The Silurian ( sih-LYOOR-ee-\u0259n, sy-)[8][9][10] is a geologic","datePublished":"2018-11-16","dateModified":"2018-11-16","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/6\/62\/Ordovicium-Silurian.jpg\/220px-Ordovicium-Silurian.jpg","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/6\/62\/Ordovicium-Silurian.jpg\/220px-Ordovicium-Silurian.jpg","height":"147","width":"220"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/silurian-wikipedia\/","about":["Wiki"],"wordCount":14144,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4Third period of the Paleozoic Era 443-419 million years ago       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The Silurian ( sih-LYOOR-ee-\u0259n, sy-)[8][9][10] is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (Mya), to the beginning of the Devonian Period, 419.2 Mya.[11] The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period’s start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician\u2013Silurian extinction events when up to 60% of marine genera were wiped out.One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants,[12][13]dikaryan fungi started expanding and diversifying along with glomeromycotan fungi,[14] and three groups of arthropods (myriapods, arachnids and hexapods) became fully terrestrialized.[15]A significant evolutionary milestone during the Silurian was the diversification of jawed fish and bony fish.[16]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Table of ContentsHistory of study[edit]Subdivisions[edit]Paleogeography[edit]Climate and sea level[edit]Perturbations[edit]Flora and fauna[edit]References[edit]External links[edit]History of study[edit]The Silurian system was first identified by British geologist Roderick Murchison, who was examining fossil-bearing sedimentary rock strata in south Wales in the early 1830s. He named the sequences for a Celtic tribe of Wales, the Silures, inspired by his friend Adam Sedgwick, who had named the period of his study the Cambrian, from the Latin name for Wales.[17] This naming does not indicate any correlation between the occurrence of the Silurian rocks and the land inhabited by the Silures (cf. Geologic map of Wales, Map of pre-Roman tribes of Wales). In 1835 the two men presented a joint paper, under the title On the Silurian and Cambrian Systems, Exhibiting the Order in which the Older Sedimentary Strata Succeed each other in England and Wales, which was the germ of the modern geological time scale.[18] As it was first identified, the “Silurian” series when traced farther afield quickly came to overlap Sedgwick’s “Cambrian” sequence, however, provoking furious disagreements that ended the friendship.Charles Lapworth resolved the conflict by defining a new Ordovician system including the contested beds.[19] An alternative name for the Silurian was “Gotlandian” after the strata of the Baltic island of Gotland.[20]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The French geologist Joachim Barrande, building on Murchison’s work, used the term Silurian in a more comprehensive sense than was justified by subsequent knowledge. He divided the Silurian rocks of Bohemia into eight stages.[21] His interpretation was questioned in 1854 by Edward Forbes,[22] and the later stages of Barrande; F, G and H have since been shown to be Devonian. Despite these modifications in the original groupings of the strata, it is recognized that Barrande established Bohemia as a classic ground for the study of the earliest Silurian fossils.Subdivisions[edit]Subdivisions of the Silurian periodEpochAgeStart(mya)Etymology ofEpochs and StagesNotesLlandoveryRhuddanian443.8Cefn-Rhuddan Farm, Llandovery in Carmarthenshire, WalesAeronian440.8Cwm Coed-Aeron Farm, WalesTrefawr Track near the farm is the site of the GSSPTelychian438.5Pen-lan-Telych Farm, Llandovery, WalesWenlockSheinwoodian433.4Sheinwood village, Much Wenlock and Wenlock Edge, Shropshire, EnglandDuring the Wenlock, the oldest-known tracheophytes of the genus Cooksonia, appear. The complexity of slightly later Gondwana plants like Baragwanathia, which resembled a modern clubmoss, indicates a much longer history for vascular plants, extending into the early Silurian or even Ordovician.[citation needed] The first terrestrial animals also appear in the Wenlock, represented by air-breathing millipedes from Scotland.[23]Homerian430.5Homer, Shropshire, EnglandLudlowGorstian427.4Gorsty village near Ludlow, Shropshire, EnglandLudfordian425.6Ludford, Shropshire, EnglandP\u0159\u00eddol\u00ed\u2014423.0Named after a locality at the Homolka a P\u0159\u00eddol\u00ed nature reserve near the Prague suburb of Slivenec, Czech Republic.P\u0159\u00eddol\u00ed is the old name of a cadastral field area.[24]Paleogeography[edit]  With the supercontinent Gondwana covering the equator and much of the southern hemisphere, a large ocean occupied most of the northern half of the globe.[25] The high sea levels of the Silurian and the relatively flat land (with few significant mountain belts) resulted in a number of island chains, and thus a rich diversity of environmental settings.[25]During the Silurian, Gondwana continued a slow southward drift to high southern latitudes, but there is evidence that the Silurian icecaps were less extensive than those of the late-Ordovician glaciation. The southern continents remained united during this period. The melting of icecaps and glaciers contributed to a rise in sea level, recognizable from the fact that Silurian sediments overlie eroded Ordovician sediments, forming an unconformity. The continents of Avalonia, Baltica, and Laurentia drifted together near the equator, starting the formation of a second supercontinent known as Euramerica.When the proto-Europe collided with North America, the collision folded coastal sediments that had been accumulating since the Cambrian off the east coast of North America and the west coast of Europe. This event is the Caledonian orogeny, a spate of mountain building that stretched from New York State through conjoined Europe and Greenland to Norway. At the end of the Silurian, sea levels dropped again, leaving telltale basins of evaporites extending from Michigan to West Virginia, and the new mountain ranges were rapidly eroded. The Teays River, flowing into the shallow mid-continental sea, eroded Ordovician Period strata, forming deposits of Silurian strata in northern Ohio and Indiana.The vast ocean of Panthalassa covered most of the northern hemisphere. Other minor oceans include two phases of the Tethys, the Proto-Tethys and Paleo-Tethys, the Rheic Ocean, the Iapetus Ocean (a narrow seaway between Avalonia and Laurentia), and the newly formed Ural Ocean.  Fossils of the late Silurian sea bedClimate and sea level[edit]The Silurian period was once believed to have enjoyed relatively stable and warm temperatures, in contrast with the extreme glaciations of the Ordovician before it and the extreme heat of the ensuing Devonian; however, it is now known that the global climate underwent many drastic fluctuations throughout the Silurian,[26][27] evidenced by numerous major carbon and oxygen isotope excursions during this geologic period.[28][29][30] Sea levels rose from their Hirnantian low throughout the first half of the Silurian; they subsequently fell throughout the rest of the period, although smaller scale patterns are superimposed on this general trend; fifteen high-stands (periods when sea levels were above the edge of the continental shelf) can be identified, and the highest Silurian sea level was probably around 140 metres (459\u00a0ft) higher than the lowest level reached.[25]During this period, the Earth entered a warm greenhouse phase, supported by high CO2 levels of 4500 ppm, and warm shallow seas covered much of the equatorial land masses.[31] Early in the Silurian, glaciers retreated back into the South Pole until they almost disappeared in the middle of Silurian.[27] Layers of broken shells (called coquina) provide strong evidence of a climate dominated by violent storms generated then as now by warm sea surfaces.[32]Perturbations[edit]The climate and carbon cycle appear to be rather unsettled during the Silurian, which had a higher frequency of isotopic excursions (indicative of climate fluctuations) than any other period.[25] The Ireviken event, Mulde event and Lau event each represent isotopic excursions following a minor mass extinction[33] and associated with rapid sea-level change. Each one leaves a similar signature in the geological record, both geochemically and biologically; pelagic (free-swimming) organisms were particularly hard hit, as were brachiopods, corals and trilobites, and extinctions rarely occur in a rapid series of fast bursts.[25][30] The climate fluctuations are best explained by a sequence of glaciations, but the lack of tillites in the middle to late Silurian make this explanation problematic.[34]Flora and fauna[edit]The Silurian period has been viewed by some palaeontologists as an extended recovery interval following the Late Ordovician mass extinction, which interrupted the cascading increase in biodiversity that had continuously gone on throughout the Cambrian and most of the Ordovician.[35]The Silurian was the first period to see megafossils of extensive terrestrial biota in the form of moss-like miniature forests along lakes and streams and networks of large, mycorrhizal nematophytes, heralding the beginning of the Silurian-Devonian Terrestrial Revolution.[12][13][36] However, the land fauna did not have a major impact on the Earth until it diversified in the Devonian.[25]The first fossil records of vascular plants, that is, land plants with tissues that carry water and food, appeared in the second half of the Silurian Period.[37] The earliest-known representatives of this group are Cooksonia. Most of the sediments containing Cooksonia are marine in nature. Preferred habitats were likely along rivers and streams. Baragwanathia appears to be almost as old, dating to the early Ludlow (420 million years) and has branching stems and needle-like leaves of 10\u201320 centimetres (3.9\u20137.9\u00a0in). The plant shows a high degree of development in relation to the age of its fossil remains. Fossils of this plant have been recorded in Australia,[38][39] Canada,[40] and China.[41]Eohostimella heathana is an early, probably terrestrial, “plant” known from compression fossils[42] of Early Silurian (Llandovery) age.[43] The chemistry of its fossils is similar to that of fossilised vascular plants, rather than algae.[42]The earliest-known animals fully adapted to terrestrial conditions appear during the Mid-Silurian, including the millipede Pneumodesmus.[23] Some evidence also suggests the presence of predatory trigonotarbid arachnoids and myriapods in Late Silurian facies.[15] Predatory invertebrates would indicate that simple food webs were in place that included non-predatory prey animals. Extrapolating back from Early Devonian biota, Andrew Jeram et al. in 1990[44] suggested a food web based on as-yet-undiscovered detritivores and grazers on micro-organisms.[45]The first bony fish, the Osteichthyes, appeared, represented by the Acanthodians covered with bony scales. Fish reached considerable diversity and developed movable jaws, adapted from the supports of the front two or three gill arches. A diverse fauna of eurypterids (sea scorpions)\u2014some of them several meters in length\u2014prowled the shallow Silurian seas of North America; many of their fossils have been found in New York state. Leeches also made their appearance during the Silurian Period. Brachiopods, bryozoa, molluscs, hederelloids, tentaculitoids, crinoids and trilobites were abundant and diverse.[46] Endobiotic symbionts were common in the corals and stromatoporoids.[47][48]Reef abundance was patchy; sometimes, fossils are frequent, but at other points, are virtually absent from the rock record.[25]Cooksonia, the earliest vascular plant, middle SilurianSilurian sea bed fossils collected from Wren’s Nest Nature Reserve, Dudley UKSilurian sea bed fossils collected from Wren’s Nest Nature Reserve, Dudley UKTrilobites were still diverse and common in the Silurian. Fossils of Calymene celebra are extremely abundant in parts of central USA.Pterygotus was a giant eurypterid that had a nearly cosmopolitan distribution^ Jeppsson, L.; Calner, M. (2007). “The Silurian Mulde Event and a scenario for secundo\u2014secundo events”. Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 93 (02): 135\u2013154. doi:10.1017\/S0263593300000377.^ Munnecke, A.; Samtleben, C.; Bickert, T. (2003). “The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events”. Palaeogeography, Palaeoclimatology, Palaeoecology. 195 (1): 99\u2013124. doi:10.1016\/S0031-0182(03)00304-3.^ “Chart\/Time Scale”. www.stratigraphy.org. International Commission on Stratigraphy.^ Lucas, Sepncer (6 November 2018). “The GSSP Method of Chronostratigraphy: A Critical Review”. Frontiers in Earth Science. 6: 191. Bibcode:2018FrEaS…6..191L. doi:10.3389\/feart.2018.00191.^ Holland, C. (June 1985). “Series and Stages of the Silurian System” (PDF). Episodes. 8 (2): 101\u2013103. doi:10.18814\/epiiugs\/1985\/v8i2\/005. Retrieved 11 December 2020.^ Chlup\u00e1\u010d, Ivo; Hladil, Jindrich (January 2000). “The global stratotype section and point of the Silurian-Devonian boundary”. CFS Courier Forschungsinstitut Senckenberg. Retrieved 7 December 2020.^ Haq, B. U.; Schutter, SR (2008). “A Chronology of Paleozoic Sea-Level Changes”. Science. 322 (5898): 64\u201368. Bibcode:2008Sci…322…64H. doi:10.1126\/science.1161648. PMID\u00a018832639. S2CID\u00a0206514545.^ Wells, John (3 April 2008). Longman Pronunciation Dictionary (3rd\u00a0ed.). Pearson Longman. ISBN\u00a0978-1-4058-8118-0.^ “Silurian”. Dictionary.com Unabridged (Online). n.d.^ “Silurian”. CollinsDictionary.com. HarperCollins.^ “International Chronostratigraphic Chart v.2015\/01” (PDF). International Commission on Stratigraphy. January 2015.^ a b Capel, Elliot; Cleal, Christopher J.; Xue, Jinzhuang; Monnet, Claude; Servais, Thomas; Cascales-Mi\u00f1ana, Borja (August 2022). “The Silurian\u2013Devonian terrestrial revolution: Diversity patterns and sampling bias of the vascular plant macrofossil record”. Earth-Science Reviews. 231: 104085. Bibcode:2022ESRv..23104085C. doi:10.1016\/j.earscirev.2022.104085. S2CID\u00a0249616013.^ a b Xue, Jinzhuang; Huang, Pu; Wang, Deming; Xiong, Conghui; Liu, Le; Basinger, James F. (May 2018). “Silurian-Devonian terrestrial revolution in South China: Taxonomy, diversity, and character evolution of vascular plants in a paleogeographically isolated, low-latitude region”. Earth-Science Reviews. 180: 92\u2013125. Bibcode:2018ESRv..180…92X. doi:10.1016\/j.earscirev.2018.03.004. Retrieved 8 December 2022.^ Lutzoni, Fran\u00e7ois; Nowak, Michael D.; Alfaro, Michael E.; Reeb, Val\u00e9rie; Miadlikowska, Jolanta; Krug, Michael; Arnold, A. Elizabeth; Lewis, Louise A.; Swofford, David L.; Hibbett, David; Hilu, Khidir; James, Timothy Y.; Quandt, Dietmar; Magall\u00f3n, Susana (21 December 2018). “Contemporaneous radiations of fungi and plants linked to symbiosis”. Nature Communications. 9 (1): 5451. Bibcode:2018NatCo…9.5451L. doi:10.1038\/s41467-018-07849-9. PMC\u00a06303338. PMID\u00a030575731. S2CID\u00a056645104.^ a b Garwood, Russell J.; Edgecombe, Gregory D. (September 2011). “Early Terrestrial Animals, Evolution, and Uncertainty”. Evolution: Education and Outreach. 4 (3): 489\u2013501. doi:10.1007\/s12052-011-0357-y.^ Brazeau, M. D.; Friedman, M. (2015). “The origin and early phylogenetic history of jawed vertebrates”. Nature. 520 (7548): 490\u2013497. Bibcode:2015Natur.520..490B. doi:10.1038\/nature14438. PMC\u00a04648279. PMID\u00a025903631.^ See:Murchison, Roderick Impey (1835). “On the Silurian system of rocks”. Philosophical Magazine. 3rd series. 7 (37): 46\u201352. doi:10.1080\/14786443508648654.  From p. 48:  ” \u2026 I venture to suggest, that as the great mass of rocks in question, trending from south-west to north-east, traverses the kingdom of our ancestors the Silures, the term “Silurian system” should be adopted \u2026 “Wilmarth, Mary Grace (1925). Bulletin 769: The Geologic Time Classification of the United States Geological Survey Compared With Other Classifications, accompanied by the original definitions of era, period and epoch terms. Washington, D.C., U.S.A.: U.S. Government Printing Office. p.\u00a080.^ Sedgwick; Murchison, R.I. (1835). “On the Silurian and Cambrian systems, exhibiting the order in which the older sedimentary strata succeed each other in England and Wales”. Report of the Fifth Meeting of the British Association for the Advancement of Science. \u00a7 Notices and Abstracts of Miscellaneous Communications to the Sections. 5: 59\u201361.^ Lapworth, Charles (1879). “On the tripartite classification of the Lower Palaeozoic rocks”. Geological Magazine. 2nd series. 6 (1): 1\u201315. Bibcode:1879GeoM….6….1L. doi:10.1017\/s0016756800156560. S2CID\u00a0129165105. From pp. 13\u201314: “North Wales itself \u2013 at all events the whole of the great Bala district where Sedgwick first worked out the physical succession among the rocks of the intermediate or so-called Upper Cambrian or Lower Silurian system; and in all probability much of the Shelve and the Caradoc area, whence Murchison first published its distinctive fossils \u2013 lay within the territory of the Ordovices; \u2026 Here, then, have we the hint for the appropriate title for the central system of the Lower Palaeozoics. It should be called the Ordovician System, after this old British tribe.”^ The Gotlandian system was proposed in 1893 by the French geologist Albert Auguste Cochon de Lapparent (1839\u20131908): Lapparent, A. de (1893). Trait\u00e9 de G\u00e9ologie (in French). Vol.\u00a02 (3rd\u00a0ed.). Paris, France: F. Savy. p.\u00a0748. 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S2CID\u00a0252569771.References[edit]Emiliani, Cesare. (1992). Planet Earth\u00a0: Cosmology, Geology, & the Evolution of Life & the Environment. Cambridge University Press. (Paperback Edition ISBN\u00a00-521-40949-7)Mikulic, DG, DEG Briggs, and J Kluessendorf. 1985. A new exceptionally preserved biota from the Lower Silurian of Wisconsin, USA. Philosophical Transactions of the Royal Society of London, 311B:75-86.Moore, RA; Briggs, DEG; Braddy, SJ; Anderson, LI; Mikulic, DG; Kluessendorf, J (2005). “A new synziphosurine (Chelicerata: Xiphosura) from the Late Llandovery (Silurian) Waukesha Lagerstatte, Wisconsin, USA”. Journal of Paleontology. 79 (2): 242\u2013250. doi:10.1666\/0022-3360(2005)0792.0.co;2. S2CID\u00a056570105.External links[edit]Wikimedia Commons has media related to Silurian.     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