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The Silurian period is the third period of the Paleozoic era. During this time the continental landmasses where low while the ocean was high. The period started after a major extinction event from the Ordovician period. There are several theories about the event one is a Glacier. Another theory is a Gamma Ray Burst, Volcanic and weather issues and finally theory is Metal Poisoning. Either way the first plants started to appear on land. Overtime the first land animals will appear.

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