Poisonous oceans delayed animal evolution
Tuesday, October 25, 2011 - 03:30
in Earth & Climate
Sedimentary rocks from Grand Canyon, USA, show evidence for widespread anoxic and sulfidic waters 750 million years ago. "We have investigated the cycling of molybdenum (Mo) in ancient oceans by studying the elemental and isotopic composition of Mo in sedimentary rocks from Grand Canyon that formed in the oceans 750 million years ago", explains Tais W. Dahl, who did this research in collaboration with researchers from Arizona State University, Harvard University and the Nordic Center of Earth Evolution in Denmark (NordCEE).