3 min read During the Ordovician period ... This resulted in the second largest mass extinction of all time, wiping out at least half of all marine animal species about 443 million years ago.
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Two-Meter-Long Fossil of Lobster-Like Animal That Swam the Seas 480 Million Years Ago Discovered, Used Its Head to Catch Prey"This would have been one of the largest animals alive at the time," added ... The period in question is the Great Ordovician Biological Diversification Event when many diverse marine forms ...
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