Rocky photosynthesis

So according to a study over at the University of Wisconsin-Madison, rocks that formed at the ocean floor 3.2 billion years ago carry unmistakable evidence of oxygen. This according to the article “Ancient rocks record first evidence for photosynthesis that made oxygen” over at Science Daily.

It’s amazing to me how they can use that to deduct that the source of that oxygen is photosynthesis that long ago. Sort of story telling by the rocks,

Sincerely-

  

Green Librarian

 

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