Cyclic variation in the CaCO 2 content of Cretaceous calcareous sediments in the Helvetic zone of the Swiss Alps is attributed to temperature changes in the waters of the depositional basin caused by climatic variations, rather than to alternating uplift and subsidence of the basin floor. The significance of cyclic calcareous sedimentation for stratigraphic correlation, as well as paleogeographic and paleoclimatic investigations, is noted.

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