thin layer of the element iridium in rock strata at the Cretaceous–Paleogene boundary English
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    /m/026nfg1
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    Q15241312 (Deleted Item)
    28 October 2013
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    Q682871 (Deleted Item)
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    iridium English
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    Q463796 (Deleted Item)
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    Q682871 (Deleted Item)
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    2776148672
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    146009
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