Devonian+by+Candylou2

==== **I chose Devonian because I wanted to learn about when the first fish came to Earth. What were the first kinds nds of fish and why and what caused the sea levels to rise and fall over what now is North America. I think it would be intresting to learn how trilobites, corals, brachiopods and other invertebrates flourished in the oceans there.** ==== **__Devonian period__ ** Before my era scorpions had taking over the sea. More fish appered and the first animals started having backbones. The Devonian periods was considered the “age of the fish”. During the Devonian era plants stared to cover earths land. Horse tails, club mosses, scale trees formed. All seas lakes, rivers and streams had thousand of fish in them. Even some fish developed lungs and crawled from puddle to puddle on land. After my era the climate was still worm and moist. Swap forested covered much of our earth. Most animals lived there young life in the water but once they were adults they lived on land.

The climate in the Devonian period was worm but also most land was under water or at sea level. At the Devonian time period the world was split in two supercontinates which were Gondwana and Euramperica
 * Massachusetts was on the south of Euramerica** .The two continents of North America and Europe collided which caused more tropical weather and made the acadian mountings a long the eastern.

Life in the Devonian time was very different from today. The Devonian period was considered the "fish age" because there were so many fish like jawless fish and armored, sharks. About 420 million years ago fish started developing jaws, which allowed fish to eat one another, and also made fish top predators. There also were giant horsetails and ferns and lots of scorpions many plants were only a meter tall by the end of the era fores tand 1st trees started to develop and amphibians started coming on to land.

The evidence have from the Devonian period includes rock such as on called Hexagonaria SP from Michigan. This rock shows that we had coral fossils in the Devonian period. We also had Gemuendina Sturzi fossils from Bundenbach Germany that helped us now that we had fish in this era. Also have a fossil of a Cephalaspis a kind of fish this shows evidence of the earliest of the vertebrates in the Devonian time. We know how the Devonian era was like because the fossils are evidence that helps us learn more about the Devonian period



See where a got this information if you just click on my bibliography