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Silurian Period, in geologic time, the third period of the Paleozoic Era. It began 443.8 million years ago and ended 419.2 million years ago, extending from the close of the Ordovician Period to the beginning of the Devonian Period.
28 Απρ 2023 · Possibly the most remarkable biological event during the Silurian was the evolution and diversification of fish. Not only does this time period mark the wide and rapid spread of jawless fish, but also the appearances of both the first known freshwater fish and the first fish with jaws.
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.
Huge reef systems flourished in the clear, tropical seas—evident today in the many limestone rock formations that date to this period. Previous reef-builders such as bryozoans were joined by...
Although there were no major periods of volcanism during the Silurian, the period is marked by major orogenic events in eastern North America and in northwestern Europe (the Caledonian Orogeny), resulting in the formation of the mountain chains there.
21 Μαΐ 2024 · At the beginning of the Silurian period were the Ordovician-Silurian extinction events, the second-largest set of extinctions in the history of the planet after the larger Permian-Triassic extinction event, which wiped out 60% of all marine genera.
20 Φεβ 2014 · The Silurian Period occurred from 443 million to 416 million years ago. It was a time of great environmental changes on Earth and saw the first evidence of life on land.
