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Eocene limestones overlying Lower Cretaceous deposits of western Istria (Croatia): Did some parts of present Istria form land during the Cretaceous?

In the region of the western Istran anticline, erosional remains of the transgressive Eocene Foraminiferal limestones overly shallow-water deposits of Early Cretaceous age (Valanginian, Hauterivian and Barremian). This evidence, together with the ocurrence of bauxite deposits and Paleogene beds overlying Albian, Cenomanian and Senonian limestones indicate the very high relief of the land transgressed by the Paleogene sea. Contrary to the traditional connection between the formation of the western Istrian anticline and the Laramian tectonic phase at the end of the Cretaceous (Maastrichtian), new investigations suggest sporadic tectonic movements (with constant tectonic coordinate orientation) from the Hauterivian to the end of the Cretaceous. With those movements, formation of the anticline structure began in the Early Cretaceous, with the emerged apical parts representing land areas throughout most of the Cretaceous.

Cretaceous; Emersion; Eocene Foraminiferal limestones; Western Istrian anticline

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