3.6-billion-year-old fossils found in Greenland could be Earth's oldest

Australian geologists discovered some really weird and extremely old structures in Greenland: fossilized mounds made by microbes that are dated to about 3.6 billion years ago. That means life on Earth started early — shortly after our planet was formed, 4.5 billion years ago.
The structures — called stromatolites — were discovered in 2012, in a remote area of Greenland called Isua. The researchers noticed the weird formations that were once covered by snow and immediately under