The Role of the Palaeogene Adriatic Carbonate Platform in the Spatial Distribution of Alveolinids

Authors : KATICA DROBNE, VLASTA COSOVIC, ALAN MORO DAMIR BUCKOVIC

Pages : 721-751

Doi:10.3906/zoo-1204-24

View : 22 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Sediments of the Palaeogene Adriatic carbonate platform, a distinctive palaeogeographic unit, are today exposed along the eastern Adriatic coast for a distance of 800 km and a width of 100-130 km. The large number of identified alveolinid species insert ignore into journalissuearticles values(69); from the Early Ypresian insert ignore into journalissuearticles values(Ilerdian); to the Bartonian record the dynamics of their evolution, with emphasis on the following: insert ignore into journalissuearticles values(1); great species diversity and great abundance in the middle Ilerdian insert ignore into journalissuearticles values(SBZ 7-8); followed by a sharp decline in occurrences at the Ilerdian/Cuisian transition; insert ignore into journalissuearticles values(2); a diversity boom in the late Ypresian insert ignore into journalissuearticles values(late Cuisian, SBZ 11-12); and insert ignore into journalissuearticles values(3); an abrupt decrease in species numbers after the early Lutetian. This pattern shows a relationship between abundance and diversity and global sea-level changes in TA and AP events. The `two peaks` model in alveolinid occurrence is present also in the `Mediterranean assemblage` in the Pyrenees and within the middle Cuisian assemblages of various Mediterranean areas. Based on studies of numerous stratigraphic sections from the Palaeogene Adriatic carbonate platform, biosedimentary zones insert ignore into journalissuearticles values(BioZ 2, BioZ 3.1, BioZ 3.2 and BioZ 4); were determined, and each zone is characterized by specific alveolinid associations. These zones are distributed as belts stretching from NE Italy insert ignore into journalissuearticles values(Friuli region); to Montenegro. Alveolinid associations served as a base for a palaeogeographic map of the Palaeogene Adriatic carbonate platform from the Thanetian to the Priabonian.
Keywords : Alveolina, Palaeogene Adriatic carbonate platform, Tethys, Cretaceous Palaeocene Priabonian, palaeogeography