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American Journal of Science|January 1, 1990
Carbonate deposition during the late Proterozoic Era: an example from SpitsbergenA H Knoll, K SwettAmerican Journal of Science|January 1, 1990
Shell structure and distribution of Cloudina, a potential index fossil for the terminal ProterozoicS W GrantAmerican Journal of Science|September 7, 2001
Paleosols and the evolution of atmospheric oxygen: a critical reviewR Rye, H D HollandPageof 2