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The Archean Eon and the Hadean
It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils.
Domein: ucmp.berkeley.edu Bekijk meer
The Proterozoic Eon
The period of Earth's history that began 2.5 billion years ago and ended 542.0 million years ago is known as the Proterozoic, which is subdivided into three ...
Domein: ucmp.berkeley.edu Bekijk meer
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