TIME SCALE CENOZOIC ERA QUARTERNARY PERIOD TERTIARY PERIOD RECENT PLEISTOCENE PLIOCENE MIOCENE OLIGOCENE EOCENE PALEOCENE RECENT = PRESENT TO 10 THOUSNAD YEARS AGO

PLEISTOCENE = 10 THOUSAND TO 1.8 MILLION YEARS AGO

PLIOCENE = 1.8 MILLION TO 5 MILLION YEARS AGO

MIOCENE = 5 MILLION TO 24.5 MILLION YEARS AGO

OLIGOCENE = 24.5 MILLION TO 37.5 MILLION YEARS AGO

EOCENE = 37.5 MILLION TO 54 MILLION YEARS AGO

PALEOCENE = 54 MILLION TO 65 MILLION YEARS AGO

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