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Earliest record of marine life. trilobites dominate. Fossils are extremely rare, primitive aquatic plants.
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Earliest terrestrial plants and animals. Peak development of euryplerids.
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Earliest amphibians and ammonites. Extinction of armored fishes, abundant fishes.
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Earliest reptiles. Great coal-forming forests. Abundant sharks and amphibians. Large and numerous scale trees and seed ferns.
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Exteinction of many kinds of marine animals, including trilobites. Little change in terrestrial animals.
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Earliest dinosaurs. Abundant cycades and conifers.
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Earliest birds and mammals. Abundant dinosaurs and ammonites.
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Earliest flowering plants. Climax of dinosaurs and ammonites-followed by extinction. Great decline of brachiopads. Great development of bony fishes.
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Humans, mastodons, mammoths and Large carnivores. Abundant grazing animals. Large running mammals, Many modern types of mammals, earliest placentel mammals.
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