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In this photo provided by Laure Gauthiez, taken in July 2012, a field team examine rocks in Greenland. 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, August 31, 2016 journal Nature. (Photo by Laure Gauthiez/The Australian National University via AP Photo)
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