Hirnantian is the last age of the Ordovician, during this time the Ordovician was going through a major extinction event. Many animals will die and a few will survive and begin the next period of the Paleozoic era.
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Hirnantian is the last age of the Ordovician, during this time the Ordovician was going through a major extinction event. Many animals will die and a few will survive and begin the next period of the Paleozoic era.
All items (6)
