Abstract
In the Tournus area (Burgundy, Paris Basin), calcareous tufa are abundant in all streams, ditchs, etc., in the formof oncolites, encrusted small branches, shells, pebbles, and blocks, floors developped on the bottom, and mosses tufa. The microfacies show numerous types of associations of laminations dark/light, micrite/micrite, sparite/micrite, contrasting with the very small number of Cyanophytes and Algae obtained by decalcification ( Phormidium, Schizothrix, Gongrosira). The Oocardium are strictly associated with mosses. These observations in modern environments provide confirmation that laminations and their variations are ecological reactions of an algal population to environmental changes. It is possible to apply these results to stromatolites and phreatic cements.
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