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Organic Reef or Bioherm

A ridge or mound composed mostly of the skeletons of sedentary calcareous organisms.

Requires warm, shallow seawater relatively free of suspended, land-derived sediment, so that photosynthesizers and filter feeders can survive.

Characterized by high biodiversity.

Fossilized reefs occur encased in rock, usually of a different lithology.

Silurian

Page 6

Silurian reef complex, Gotland, Sweden.

Image courtesy of Hannes Grobe.

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