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Earliest abundant record of marine life Trilobites dominant
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Invertebrates dominant
Coelenterates and mollusks become abundant -
Earliest terrestrial plants and animals Peak development of euryplerids
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Earliest amphibians and ammonites
Extinction of amored fishes, abundant fishes -
Earliest reptiles
Abundant sharks and amphibians
Large and numerous scale trees and seed ferns -
Extinction of many kinds of marine animals, including trilobites
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Earliest dinosaurs
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Earliest birds, and mammals
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Earliest flowering plants
Climax of dinosaurs and ammonites followed by extinction -
Large running mammals
Many modern types of mammals
Abundant grazinf animals -
Humans
Mastodons
Mammoths
Large carnivores
