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|Image information: Diagram after James (1983), Fig. 57.|
Bioherms are mound- or lens-shaped structures composed mainly of the skeletons or shells of carbonate-secreting organisms. Some are true, in situ reefs, whilst others formed as banks of loose, transported skeletal material.
Biostromes are ribbon or sheet-shaped structures, also made largely of skeletal material, either in growth position (reefs in the strict sense) or transported.
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