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Significance The evolution of the biota and of atmospheric composition have been tightly coupled throughout Earth history. Of key importance has been the establishment of an oxygen-rich atmosphere, and this has apparently occurred in two major steps. The second step occurred during the Neoproterozoic, at the time when various lines of evidence suggest a significant expansion of terrestrial life and soil development. The present paper links these two events in a unique way, not through increased oxygen production on land, but through increased consumption in biotic soils that until compensated by higher atmospheric oxygen levels, restricted the supply of oxygen to the weathering environment.

Hypothesized link between Neoproterozoic greening of the land surface and the establishment of an oxygen-rich atmosphere