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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