Glossary: Precambrian
The largest division (ninety percent) of geologic time, from 4.55 to 0.55 billion years ago. It precedes the Cambrian Period and is subdivided into the Hadean, Archean and Proterozoic Eons.
The largest division (ninety percent) of geologic time, from 4.55 to 0.55 billion years ago. It precedes the Cambrian Period and is subdivided into the Hadean, Archean and Proterozoic Eons.