Put these time divisions in order, from longest to shortest. eon period epoch

The order from the longest to the largest will be; Eon, Era, Period, Epoch.

Eon is the longest division of geologic time. Epoch is the shortest division of geologic time, only present in Cenozoic Era. Era is the second longest division of time, marked by sweeping changes in the fossil record. Period is the time division which is longer than an epoch but shorter than an Era.