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Geologic Time Scale

Mesozoic

TermDefinition
Mesozoic 251.0 - 65.5 mya
Cretaceous 145.5 - 65.5 mya
Upper Cretaceous 99.6 - 65.5 mya
Lower Cretaceous 145.5 - 99.6 mya
Jurassic 199.6 - 145.5 mya
Upper Jurassic 161.2 - 145.5 mya
Middle Jurassic 175.6 - 161.2 mya
Lower Jurassic 199.6 - 175.6 mya
Triassic 251.0 - 199.6 mya
Upper Triassic 228.7 - 199.6 mya
Middle Triassic 245.9 - 228.7 mya
Lower Triassic 251.0 - 245.9 mya
Created by: bizz1441
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