A major extinction, the Kellwasser event marked the beginning of the last phase of the Devonian period, the Famennian faunal stage about 375-360 million years ago. A second mass extinction, the Hangenberg event, closed the Devonian period. It is still unclear as to the extent of time during these extinctions, as it is uncertain whether there were two sharp mass extinctions or a series of smaller extinctions. By the late devonian, land had been colonized by plants and insects, and the oceans were massive reefs built by corals and stromatoporoids. The extinction for the most part hit marine life. Euramerica and Gondwana were beginning to converge into what would become Pangea.
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