Pieces of a Pulverizer?

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    • Abstract:
      Reports on the findings of researchers examining ancient sediments laid down just after Earth's most devastating episode of extinction at the end of the Permian period. Extraterrestrial fingerprint on the microscopic fragments of metals and minerals extracted from the sediments; Speculation on the cause of Permian extinction; Chemical composition of the grains in the mixed-mineral particles found on the sediments.