engleski

Orbitolinid biostratigraphy of the Aptian and Albian carbonate deposits on the island of Cres (Adriatic Sea, Croatia)

During the work on the Geological map of the Republic of Croatia (1:50.000 scale) it has been determined that Aptian and Albian shallow-water limestones on the Island of Cres (Northern Adriatic) contain a rather rich foraminiferal association, especially concerning the abundance and diversity of orbitolinid forms. Their stratigraphic distribution has been studied on three different localities due to the lateral and vertical facies and thickness variability in the study area. Biostratigraphy, exclusively based on the orbitolinid taxa and their chronostratigraphic position, is for the first time proposed for the Lower Cretaceous deposits on the Island of Cres. Three biozones have been established: Palorbitolina lenticularis Taxon-range Zone in the Lower Aptian, Orbitolina (M.) texana Assemblage Zone in the Uppermost Aptian to Lower Albian and "Valdanchella" dercourti Taxon-range Zone in the basal Upper Albian.

Orbitolinids; biostratigraphy; Aptian; Albian; Cres; Croatia

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