Period.
epoch
Eon is the broadest division on the geologic time scale, representing the longest time span. Eons are further divided into eras, which are then subdivided into periods, epochs, and ages.
The third largest division of geologic time is an era. The eras are further divided into periods, epochs, and ages.
Epoch
Eon
Precambrian time
After an era, the next smallest division of time would be an epoch. An epoch is equal to around 10,000,000 years, where as an era is 100,000,000 years.
The shortest division in the geologic time scale is an Epoch. Epochs are subdivisions of a period and are typically tens of millions of years long.
an era uhm NO ^ an eon . (apex)
A long span of geologic time is called an era. This is a major division of geologic time that is further subdivided into periods. Examples of eras include the Paleozoic, Mesozoic, and Cenozoic.
A period is smaller than an era in the geologic time scale. It is further subdivided into epochs and ages.
an era uhm NO ^ an eon . (apex)