Discovery Of Earth's Oldest Fossils Has Implications For Mars
The fossils date back 3.7 billion years.By Ryan Biek | September 1, 2016
It's an ancient 3.7 billion years. That's how old recently discovered fossils in Greenland are believed to be, making them the oldest ever found.
Life that far back consisted of single-cell bacteria. The fossils aren't the remains of these kinds of bacteria but are more evidence of their life in shallow water as they formed colonies.
Up until this discovery, Earth's oldest fossils were 3.5 billion years old.