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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.
