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Caption: This is layered gypsum and anhydrite from the Castille Formation, N.M. This image relates to a paper that appeared in the July 20, 2012, issue of Science, published by AAAS. The paper, by I. Halevy at Weizmann Institute of Science in Rehovot, Israel, and colleagues was titled, "Sulfate Burial Constraints on the Phanerozoic Sulfur Cycle."
Credit: Courtesy of Shanan Peters
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