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The first dinosaurs such as Coelophosis and Euskelosaurus, and mammals, turtles, crocodiles and frogs appeared.
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The first reptiles appeared. Great swamp forests covered the land.
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The first nautiloids appeared. Corals and trilobites were common.
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The first fishes, corals, trilobites and shellfish appeared.
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The first land plants and giant sea scorpions called Eurypterids appeared.
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The first amphibians, insects and spiders appeared
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The first sailback reptiles such as Dimetrodon (right) appeared.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.