A Threshold in Phanerozoic Oxygen Concentrations: Evidence from Carbonate Sediment Color and Physiological Requirements of Marine Fauna

Rishi Sugla1, Richard D Norris1 and Jacques Lyakov2, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Scripps Institution of Oceanography, Geosciences Research Division, La Jolla, CA, United States