For 10 points, name this period lasting from approximately 290 to 248 million years ago, which ended with the largest mass extinction ever recorded on Earth.
Animals extant during this period include Edaphosaurus and Dimetrodon, and the dominant lifeforms during this period were therapsids, the direct ancestors of mammals. Gymnosperms became the dominant form of plant life during this period. During this period, the supercontinent of Pangaea was formed. This was the last period of the Paleozoic Era. For 10 points, name this period lasting from approximately 290 to 248 million years ago, which ended with the largest mass extinction ever recorded on Earth.
Animals extant during this period include Edaphosaurus and Dimetrodon, and the dominant lifeforms during this period were therapsids, the direct ancestors of mammals.
{Permian} Period