Mount McRae Shale (IMAGE)

University of Washington

Mount McRae Shale

Caption

A drill core from the 2.5 billion-year-old Mount McRae Shale formation in Western Australia, which originally was fine-grained ocean sediment, shows high concentrations of sulfide and molybdenum. That supports the idea that most of the sulfate came from land, likely freed by microbial activity on rocks. Some data for the research came from the Mount McRae formation.

Credit

Roger Buick/U. of Washington

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