Abstract
A Lower Devonian organic buildup (Moniello Formation) from the Cantabrian Mountains (Asturias, NW Spain) displays a vertical paleoecological zonation reflecting different stages in the reef development. Four zones have been established, namely: stabilization, colonization, diversification and domination zones. The biologic and taxonomic composition of these zones as well as their lithofacies relations are indicated. Rugose corals ( Synaptophyllum) played an important role as stabilizing organisms; the frame builders themselves (Stromatoporoids and Corals) also contribute to that function. Finally, the autogenic or allogenic character of the succession is discussed.
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