Abstract

In early and Middle Devonian reefal palaeoenvironments along the eastern margin of the Armorican Massif and in the Boulonnais, the study of relations between constructing organisms (Stromatoporoids, Tabulate Corals, Rugose Corals), Calcareous Algae and sedimentation enables to recognize four types of interaction. Each type, localized in time and space, is the purpose of a detailed analysis which comports: the description of involved organisms, the description of their mutual relations as with the ambiant sedimentation and the process of the interaction. The general conclusion focuses the main characteristics of these different types of interaction.

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