Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen

There is a long standing debate whether low atmospheric oxygen levels during the Mesoproterozoic Era hindered the evolution of crown-group animals. Here, the authors show with shale-hosted chromium isotopes that sufficient atmospheric oxygen for crown-group animals likely predated their evolution by...

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Bibliographic Details
Main Authors: Donald E. Canfield, Shuichang Zhang, Anja B. Frank, Xiaomei Wang, Huajian Wang, Jin Su, Yuntao Ye, Robert Frei
Format: article
Language:EN
Published: Nature Portfolio 2018
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Online Access:https://doaj.org/article/84862de8b71d49fdbaf7ce18c3acd1ca
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