Abstract

The stratigraphic succession exposed on the southern slope of Mt. Sabotino consists mainly of carbonate platform margin deposits of Late Cretaceous age. The oldest unit studied (Lower-Middle Cenomanian) is made of bioclastic limestones and can be interpreted as a prograding sequence developed along the margin of the Friuli carbonate platform. The overlying Upper Cenomanian deposits prove a relatively more sheltered environment. At the top of this unit there is an important stratigraphic hiatus marked by paleokarstic features and bauxitic deposits. The gap ranges from the latest Cenomanian to the Coniacian p.p. Therefore, this sector of the NE margin of the Friuli platform underwent a prolonged subaerial exposure whereas the southern areas of the platform were generally drowned at the top of the Cenomanian. More open conditions are again recorded in the Santonian succession of Mt. Sabotino, where horizons with plank-tonic foraminifers occur in a context of a platform margin dominated by bioclastic deposits consisting mainly of rudist debris. A prevailing tectonic control on the sedimentary evolution of the carbonate platform during Late Cretaceous is suggested.

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