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Abstract
When discussing the relationship between lithology and faunal distribution patterns in a part of the Ooser Plattenkalk-sequence (Upper Devonian, Adorf-Stufe, Eifel Mountains, Germany), Böger (1966) quoted that neither the theory of Krebs 1962 (interchange of shallow and deeper marine environments) nor the interpretation of Meischner 1964 (intercalation of calcareous turbidites, “allodapic limestones”) is satisfactory.
It is pointed out here that Böger's observations can be explained by a rather simple mechanism: Calcareous ooze of turbidity currents is transported to the farthest parts of near-reef basins where it gives rise to the precipitation of carbonate, if the hydrographical conditions are favourable. By the same turbidity current the bottom water is replaced by oxygen-rich water and the migration of low pH, low Eh water from the sediment up into the bottom water is prevented by the newly formed sediment layer. This gives for a short time an opportunity for the development of a more advanced benthonic fauna.