Time since the emergence of earliest reptiles

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

/fact/time-since-the-emergence-of-earliest-reptiles

Link

Neat Ratios ...

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

is 2.5 x Time since the emergence of flowering plants (125 million y)...more
is 5 x Length of one Alautun, longest unit in Mayan calendar (63.1 million y)...more

If this was a standard unit ...