From ABC News in Science, 1 September 2016:
The oldest fossils known to date have been discovered in 3.7 billion-year-old rocks in Greenland by an Australian-led team of researchers.
The discovery of the fossilised bacterial communities, known as stromatolites, could be the first clear biological evidence of the earliest known life on Earth, according to a paper published today in Nature.
Before this find, the earliest accepted evidence for life were 3.48 billion-year-old fossil stromatolites from the Pilbara region in Western Australia. Read more.