The Precambrian time refers to the span of time from Earth’s formation to the start of the Cambrian period. This encompasses a vast amount of geologic time, including the Hadean, Archean, and Proterozoic eons, and covers roughly 4.6 billion years up to about 541 million years ago when the Cambrian period began.
What is Precambrian time?
the span of time between the Hadean and Proterozoic eons
the span of time from Earth’s formation to the start of the Cambrian period
the span of time dating from 540 million years ago to the turn of the first century
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