Greenland may be home to Earth’s oldest fossils
3.7-billion-year old mounds signal early microbes
![stromatolites](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/08/083116_ts_oldest-fossil_main_free.jpg?fit=1030%2C551&ssl=1)
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