CERTAIN DATA ON THE GENESIS AND ECOLOGIC CHARACTER OF FRASNIAN REEFS OF THE ARDENNES

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Abstract
The confinement of origin and development of modern coral reefs to the zone of turbulence is apparently linked to the symbiosis of corals and zooxanthellids. The Frasnian (Devonian) reefs of the Ardennes (Belgium) were constructed by stromatoporoids or corals, with associated marine forms. Reefs formed of massive stromatoporoids developed in the zone of turbulence; coral reefs were constructed beneath this zone; and mixed reefs either started in one environment and shifted to another or developed in an intermediate zone. To each one of these environmental conditions there corresponds a particular morphologic structural type. G. E. Denegar

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