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Ordovician period

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Ordovician period

Period of geological time 510-439 million years ago; the second period of the Palaeozoic era. Animal life was confined to the sea: reef-building algae and the first jawless fish are characteristic.

The period is named after the Ordovices, an ancient Welsh people, because the system of rocks formed in the Ordovician period was first studied in Wales.
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