Precambrian era is the geologic time prior to the phanerozoic eon.and it is the earliest era of the Earth's history.
Precambrian era is the earlier era of Earth's history which is before the current Phanerozoic Eon. The Precambrian preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria. It is the era where Wales, rocks, were first studied.
This encompasses the Archean and Proterozoic eons with intervals that lasted from 4 billion to about 541 million years ago, and the Hadean Eon with interval from 4.6 billion to 4 billion years ago.
It is not divided into Epochs because it's fossil records are difficult to interpret.
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