You searched for: “archaeozoic
Archaeozoic, Archeozoic
1. Living in the earliest geological era.
2. The time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms were the earliest forms of life.
3. Formed in the earlier of two divisions of the Precambrian era.
4. Noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered.