Tracking down the oldest traces of life on Earth isn't easy.
Smoosh a bunch of microbes between layers of rock and let them ripen for billions of years; what you end up with is going to resemble rock more than an ancient life form.
Now a new analysis by an international team of researchers provides strong evidence that these formations really are biological in origin, and not the result of non-living processes. The job of the paleontologist is to try to work out which is which – not always easy, as seen in 3.7 billion-year-old stromatolite-like layers in Greenland, which were first declared the world's oldest fossils and thenBut the identification of the oldest fossils on this marvelous, 4.54 billion–year-old blue marble of ours isn't just an exercise in breaking records.
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