The Great Dying
Extinction
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A mass extinction event occurs, marking the end of the Paleozoic Era and the passing of more than 75% of Frith's species. The Mesozoic Era begins.
Driven by tectonic events and massive changes to the marine environment, a mass extinction event occurs at this point in time. This marks the end of the Paleozoic and the beginning of the Mesozoic. It would take the planet more than thirty million years to fully recover in biodiversity.