![Oncoidal granular iron formation in the Mesoarchaean Pongola Supergroup, southern Africa: Textural and geochemical evidence for biological activity during iron deposition]()
Oncoidal granular iron formation in the Mesoarchaean Pongola Supergroup, southern Africa: Textural and geochemical evidence for biological activity during iron depositionSmith, A. J. B.; Beukes, N. J.; Gutzmer, J.; Czaja, A. D.; Johnson, C. M.; Nhleko, N. · Geobiology · 2017