The Silurian is a geologic period and system that extends from the end of the Ordovician period, about 443.7 ± 1.5 Ma (million years ago), to the beginning of the Devonian period, about 416.0 ± 2.8 Mya. 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 several million years. The base of the Silurian is set at a major extinction event when 60% of marine species were wiped out. See Ordovician-Silurian extinction events.

Silurian period 444-416
Llandovery 444-428			Wenlock 428-423		Ludlow 423-419		Pridoli 419-416
Rhuddanian 444-439	Aeronian 439-436	Telychian 436-428	Sheinwoodian 428-426	Homerian 426-423	Gorstian 423-421	Ludfordian 421-419

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