Fossils 2.3 billion years old

J. William Schopf/UCLA Center for the Study of Evolution and the Origin of Life

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.

Download Photo (118.1 kB)