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spherules <a spherule; spherules> SUST.

spherules

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The spherules were most abundant in slowly accumulating sediments, particularly red clays deposited below the carbonate compensation depth, a finding that supported a meteoritic origin. en.wikipedia.org

Analysis indicates that these spherules are apparently concretions formed from a water solution. en.wikipedia.org

These cuttings were examined carefully, during which graduate students working for him found microscopic iron spherules to him irrefutable evidence of an impact crater. en.wikipedia.org

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