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Definition of bioclast
bioclasts
geology
: a fragment of biological origin (such as a shell fragment or fossil) occurring in sedimentary rock You can have fabrics full of bioclasts—fragments of organic origin, such as bits of plants or clamshells—and you can classify the kinds of mineral grains, their size and distribution. — Karen Chin, quoted in Discover, June 1996
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First Known Use of bioclast
1963
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