Ancient rocks record first evidence for photosynthesis that made oxygen

Monday, October 5, 2015 - 18:00 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 University of Wisconsin-Madison geoscientists. “Rock from 3.4 billion years ago showed that the ocean contained […]

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