Silurian
Geologic period
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The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya. The Silurian is the shortest period of the Paleozoic... Wikipedia
Length: 24.6 million years
Occurred: 443.8 (+/- 1.5) million years ago - 419.2 (+/- 3.2) million years ago
Era: Paleozoic
Epochs: Llandovery, Wenlock Epoch, Ludlow, and more
Chronological unit: Period
First proposed by: Roderick Murchison, 1835
Lower boundary definition: FAD of the Graptolite Akidograptus ascensus