Ordovician
The Ordovician period (500 to 440 million years ago) comes after the Cambrian in the early Paleozoic era. The period is named for a Celtic tribe named the Ordovices who once lived in the ar...
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Ordovician Period
In geologic time, the Ordovician Period, the second period of the Paleozoic Era, covers the time roughly 505 million years ago (mya) until 438 mya. The name Ordovician derives from t...
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Ordovician
Ordovician Period