erm might wanna find out meaning of tertiary first
Reptiles
Animals such as Dimetrodon and Edaphosaurus lived during the Permian Period.
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During the Silurian, the bony fish first appeared. There were many different species of fish that lived in the world's oceans. Trilobites, brachiopods, and mollusks were also very common.
uintatherium, plesiadapis, and hyracotherium are some of many species