Time since the emergence of earliest reptiles

Time since the emergence of earliest reptiles (315 million y)

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If Time since the emergence of earliest reptiles (315 million y) was a standard unit ...

Time since the emergence of flowering plants (125 million y)...more would be 2/5 of Time since the emergence of earliest reptiles
Length of one Alautun, longest unit in Mayan calendar (63.1 million y)...more would be 1/5 of Time since the emergence of earliest reptiles