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Что (кто) такое Silurian$75224$ - определение
![''[[Cooksonia]]'', the earliest vascular plant, middle Silurian](https://commons.wikimedia.org/wiki/Special:FilePath/Cooksonia.png?width=200 "''[[Cooksonia]]'', the earliest vascular plant, middle Silurian")
![[[Crinoid]] fragments in a Silurian (Pridoli) limestone ([[Saaremaa]], Estonia)](https://commons.wikimedia.org/wiki/Special:FilePath/Kaugatuma Bedding Plane Pridoli Estonia.jpg?width=200 "[[Crinoid]] fragments in a Silurian (Pridoli) limestone ([[Saaremaa]], Estonia)")
![''[[Eurypterus]]'', a common Upper Silurian [[eurypterid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Eurypterus Paleoart.jpg?width=200 "''[[Eurypterus]]'', a common Upper Silurian [[eurypterid]]")
![U.S]].](https://commons.wikimedia.org/wiki/Special:FilePath/Poraspis.jpg?width=200 "U.S]].")
![Tabulate coral]], an extinct group that lived through the Paleozoic](https://commons.wikimedia.org/wiki/Special:FilePath/HalysitesSilurian.jpg?width=200 "Tabulate coral]], an extinct group that lived through the Paleozoic")
![''[[Parioscorpio]]'' was an enigmatic arthropod from the Silurian of [[Wisconsin]]](https://commons.wikimedia.org/wiki/Special:FilePath/20211029 Parioscorpio venator.png?width=200 "''[[Parioscorpio]]'' was an enigmatic arthropod from the Silurian of [[Wisconsin]]")
![New York]]](https://commons.wikimedia.org/wiki/Special:FilePath/Dalmanites limulurus trilobite silurian.jpg?width=200 "New York]]")
![pentamerid]] brachiopods from strata in [[Indiana]]](https://commons.wikimedia.org/wiki/Special:FilePath/Geodized pentamerid brachiopods (Silurian; Swayzee, Indiana, USA) 1.jpg?width=200 "pentamerid]] brachiopods from strata in [[Indiana]]")
![Placoderm]] fish from the late Silurian](https://commons.wikimedia.org/wiki/Special:FilePath/Entelognathus.png?width=200 "Placoderm]] fish from the late Silurian")
![issn=1476-4687}} is a tooth-based chondrichthyan genus from the early Silurian ([[Aeronian]]) of China](https://commons.wikimedia.org/wiki/Special:FilePath/Qianodus holotype.jpg?width=200 "issn=1476-4687}} is a tooth-based chondrichthyan genus from the early Silurian ([[Aeronian]]) of China")
![spiny shark]] from the lower Silurian ([[Aeronian]]) described from disarticulated dermoskeletal elements](https://commons.wikimedia.org/wiki/Special:FilePath/Fanjingshania.jpg?width=200 "spiny shark]] from the lower Silurian ([[Aeronian]]) described from disarticulated dermoskeletal elements")
![Anaspid]] fish](https://commons.wikimedia.org/wiki/Special:FilePath/Jamoytius kerwoodi.jpg?width=200 "Anaspid]] fish")
![''[[Pterygotus]]'' was a giant eurypterid that had a nearly cosmopolitan distribution](https://commons.wikimedia.org/wiki/Special:FilePath/20201227 Pterygotus anglicus.png?width=200 "''[[Pterygotus]]'' was a giant eurypterid that had a nearly cosmopolitan distribution")
![''[[Sphooceras]]'' was a [[Nautiloid]] [[cephalopod]] found in Silurian strata of the [[Czech Republic]]](https://commons.wikimedia.org/wiki/Special:FilePath/Sphooceras-truncatum.jpg?width=200 "''[[Sphooceras]]'' was a [[Nautiloid]] [[cephalopod]] found in Silurian strata of the [[Czech Republic]]")
.jpg?width=200 "The Sea Devils, shown at a 50th Anniversary event.")
.jpg?width=200 "Silurians, with their masks on, on display at an exhibition.")
Википедия
The Silurian ( sih-LYOOR-ee-ən, sy-) 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. 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–Silurian 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, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods (myriapods, arachnids and hexapods) became fully terrestrialized.
A significant evolutionary milestone during the Silurian was the diversification of jawed fish and bony fish.
