Jeerinah Formation in Western Australia -- For Paper (image)

Caption
The Jeerinah Formation in Western Australia, where a UW-led team found a sudden shift in nitrogen isotopes. "Nitrogen isotopes tell a story about oxygenation of the surface ocean, and this oxygenation spans hundreds of kilometers across a marine basin and lasts for somewhere less than 50 million years," said lead author Matt Koehler.
Credit
Roger Buick / University of Washington
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