What the rise of oxygen on early Earth tells us about life on other planets - Phys.Org

To find answers, the researchers examined iron-rich sedimentary rocks from around the world deposited in ancient coastal environments. In analyzing the chemistry of the iron in these rocks, the researchers were able to estimate the amount of oxygen present when the rocks formed, and the impact it would have had on early life like eukaryotic microorganisms—the precursors to modern animals.

"These ironstones offer insights into the oxygen levels of shallow marine environments, where life was evolving. The ancient ironstone record indicates around less than 1% of modern oxygen levels, which would have had an immense impact on ecological complexity," says Changle Wang, a researcher at the Chinese Academy of Sciences who co-led the study with Lechte.

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2022-01-31 21:07:34Z
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