University of Idaho Organisms and Environments  
Precambrian Times, Hadean - Proterozoic Eons Cambrian - Ordovician Periods Silurian - Permian Periods Triassic - Cretaceous Periods Tertiary - Quaternary Periods Evolutionary Timeline
Silurian through Permian Periods 444  - 251 mya

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Dept. Biological Sciences - University of Idaho
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