Greenland may be home to Earth’s oldest fossils

3.7-billion-year old mounds signal early microbes

stromatolites

EARLY START  The wavelike mounds of sediment called stromatolites (marked by dashed lines) embedded inside this cross section of a 3.7-billion-year-old rock may be the oldest known fossilized evidence of life on Earth.

A. Nutman, A.C. Allwood/Nature 2016

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