We live in the Cenozoic era. Currently, we are in the Holocene epoch of the Quaternary period.
Humans evolved in the Pleistocene epoch which was also in the Quaternary period.
Precambrian is the largest division of the geologic time scale.
Period.
epoch
Eon.
Eon
Epoch
period.
epoch
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.
Precambrian time
The geologic time scale that represents the longest time span is the eon. It is a unit of time that is equal to a billion years.
It is a "period" and then an "epoch".