Time since the end of the Cretaceous geologic period

Time since the end of the Cretaceous geologic period (66 million y)

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Neat Ratios ...

Time since the end of the Cretaceous geologic period (66 million y)

is about as big as Time since the extinction of dinosaurs (66 million y)...more
is 25 x Age of earliest stone hand axe (2.6 million y)...more
is 10000 x Age of the earliest city (6,500 y)...more

If this was a standard unit ...