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Leidman, Sasha Z.; Rennermalm, Åsa K.; Broccoli, Anthony J.; van As, Dirk; van den Broeke, Michiel R.; Steffen, Konrad; Hubbard, Alun Lloyd

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Kreitsmann, T.; Lepland, Aivo; Bau, M.; Prave, A.R.; Paiste, Kärt; Mänd, K.; Sepp, H.; Martma, T.; Romashkin, A.E; Kirsimäe, K.

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Petrini, Michele; Colleoni, Florence; Kirchner, Nina; Hughes, Anna L.C.; Camerlenghi, Angelo; Rebesco, Michele; Lucchi, Renata Giulia; Forte, Emanuele; Colucci, Renato R.; Noormets, Riko; Mangerud, Jan

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great oxydation event

Photo of the month


This is shungite, a unique carbon-rich sedimentary rock from Russia that deposited 2 billion years ago. It holds clues about oxygen concentrations on Earth’s surface at that time. According to a new study in Nature Geoscience, with participation from CAGE,  there were elevated levels of oxygen at the time when the shungite was deposited.

This contradicts the widely-accepted models of Earth’s carbon and oxygen cycles, which predict that shungite should have been deposited at a time of rapid decrease in oxygen levels.

Why is this important?: “These new findings are also crucial for understanding the evolution of complex life.” according to this article in Eurekalert.org. 

Geology. Pretty awesome.

Photo: Aivo Lepland, NGU/CAGE.

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