In this photo provided by Allen Nutman, a rock with the stromatolites, tiny layered structures from 3.7 billion years ago that are remnants from a community of microbes that used to be live there. Scientists have found what they think is the oldest fossil on Earth, a remnant of life from 3.7 billion years ago when Earth’s skies were orange and its oceans green. In a newly melted part of Greenland, Australian scientists found the leftover structure from a community of microbes that lived on an ancient seafloor, according to a study in Wednesday, Aug. 31, 2016 journal Nature. (Allen Nutman/University of Wollongong via AP)

Read more at: http://phys.org/news/2016-08-scientists-billion-year-old-fossil-oldest.html#jCp