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| bi·o·strome [ b ə strm ] (plural bi·o·stromes) |
noun |
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| Definition: |
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separate layer in rock: a thin layer in a rock formation that consists of organic material such as fossils deposited at the site where they lived
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| [Early 20th century. < modern Latin biostroma< Greek bios "life" + strōma "bed, covering"] |
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