The transitional Neoproterozoic era showed several significant changes in the Earth system, including the gradual breakup of the supercontinent Rodinia from ∼825 Ma to ∼570 Ma ( 10 – 12 ), possibly significant fluctuations in atmospheric oxygen ( 13 ), and two severe failures of Earth’s silicate weathering feedback ( 14 ) within the Cryogenian Period (717 to 635 Ma) that glaciated the continents down to the equator ( 15 , 16 ).
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