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biostrome

noun bi·o·strome \ ˈbīəˌstrōm \
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Definition of biostrome

plural -s
: a distinctly bedded or broadly lenticular body of rock composed mainly of the remains of sedentary organisms (such as shell beds, crinoid beds, or coral beds) — compare bioherm

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Origin and Etymology of biostrome

2bi- + Late Latin stroma coverlet, from Greek strōma bed, mattress

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