Fossils 2.3 billion years old
J. William Schopf/UCLA Center for the Study of Evolution and the Origin of Life

Fossils 2.3 billion years old

A section of a 2.3 billion-year-old fossil-bearing rock. The fossils (the dark areas) are essentially identical to ones that are 500 million years younger, and to modern microorganisms that live in seawater mud.


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