Dinosaurs Where Not The First Creatures on Earth

There were two time periods before the dinosaurs, the first time period was the Precambrian, the Precambrian time period lasted 4058 Million years! The Precambrian time period includes the Archean and Proterozoic time periods. These time periods consisted of jellyfish, flatworms, and many other boneless and no-shelled sea dwelling creatures.

The Next Time Period was called the Paleozoic, and lasted about 291 Million years, in which is a lot shorter than the Precambrian time period. The Paleozoic time period consists of six different time periods, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The first shell fish appeared in the Cambrian, and fish with bones evolved in the Ordovician and Silurian time periods. Then Fish evolved legs (Amphibians) And roamed the land. Then in the Carboniferous time period larger and more developed marine animals came about. Finally, came the Permian, this is when the first mammals and reptiles evolved. The first mammals were called Synapsids, and the first reptiles were called Pseudosuchians.

After the Paleozoic came the Mesozoic, the age of the dinosaurs...

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