Silurian

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Related to Silurian era: Ordovician period

Silurian

1. of, denoting, or formed in the third period of the Palaeozoic era, between the Ordovician and Devonian periods, which lasted for 25 million years, during which fishes first appeared
2. of or relating to the Silures

Silurian

[si′lu̇r·ē·ən]
(geology)
A period of geologic time of the Paleozoic era, covering a time span of between 430-440 and 395 million years ago.
The rock system of this period.