TrekGEO > Geology of Japan > Sedimentary facies > Organic reef

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Organic reef

Shallow marine


A sedimentary system composed of a series of sedimentary facies in organic reefs such as coral reefs. Lagoon is formed by the biological activity of reef-forming corals. It is reported that dominant organisms in organic reefs are different in ages; Cambrian archeocyathids, Devonian stromatoporoids - rugose corals, Late Jurassic to Early Cretaceous stromatoporoids-hexacorallia, Late Cretaceous rudists, Neogene to present hexacorallia. The growth speed of modern coral reefs is estimated as 0.5 - 1.5 mm/year, and 6 mm/year in maximum.

Organic reef

Schematic diagram of organic reefs.

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