Ancient rocks record first evidence for photosynthesis that made oxygen

Tuesday, October 6, 2015 - 18:50 in Paleontology & Archaeology

A new study shows that iron-bearing rocks that formed at the ocean floor 3.2 billion years ago carry unmistakable evidence of oxygen. The only logical source for that oxygen is the earliest known example of photosynthesis by living organisms, say geoscientists.

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