Ordovician+Period

=3rd= =the ordovician period lasted 45 million years it began 488.3 million years ago and ended 443.7 million years ago. the animals that where around the were snails and clams and red and green alge was around back then too. towards the end of the ordovician period there was the greatest mass extiction ever recorded in earths history. over 100 speicies went extinct.=

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