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Contact: Nicole Cassis
Arizona State University


Caption: The research team analyzed carbonate rock samples collected from the Dawen Permian-Triassic boundary section located on the Great Bank of Guizhou, a carbonate platform in China's Guizhou Province. Uranium isotopes measured in these ancient rocks showed that the world's oceans experienced a rapid shift toward strongly oxygen-deficient conditions at the time of the end-Permian mass extinction.

Credit: Tom Algeo

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