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- sedimentary rock carbonate rock biostrome
bioherm, ancient organic reef of moundlike form built by a variety of marine invertebrates, including corals, echinoderms, gastropods, mollusks, and others; fossil calcareous algae are prominent in some bioherms. A structure built by similar organisms that is bedded but not moundlike is called a biostrome. Bioherms and biostromes occur in sedimentary rock strata of all geological ages, providing definitive information on paleoenvironments in the vicinity of their occurrence.