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The latest field investigation of the Vrdnik Coal Basin as well as new data   from numerous boreholes enabled the finding of an unconformity between the   undivided continental-lacustrine Lower Miocene and the marine Middle Miocene   Badenian. The different terrestrial-lacustrine sediments indicate a very   mobile and dynamic environment (according to known drilling data, the total   thickness of these deposits reaches up to 300 m). All these rocks belong to   the Vrdnik series (Vrdnik Formation). The evolution of the Vrdnik series is   distinguished by several stages (e.g. pre-lacustrine, lacustrine, peat-swamp,   etc.). Each of these phases was proved by their sedimentologic and structural   characteristics. On the other hand, among the fossils, only the swamp flora   remains (Sequoia, Laurus, Taxodium, Glyptostrobus, etc.) and poor and   fragmented ostracode valves (Candona sp.) were documented. Presently, the   exact stratigraphic position of the Vrdnik series is unknown. Discordantly   over the mentioned rocks, real marine sediments of the Paratethys Sea occur.   To date, it was a completely unknown subsurface distribution of these   sediments. Among a few types of rocks that have a small distribution, the   so-called the Leitha limestones (Middle Miocene, Badenian) have great   significance (up to 98% of CaCO3). The total thickness of the limestones   reaches up to 70 meters (borehole B-11). The findings of key foraminifer   species (Orbulina - Globigerinoides Zone) indicate an early Badenian   (Moravian) transgressive event (ca. 15 Ma). Lithologically, it is represented   by gray, sandy marls and sandy clays, coarse-grained sands and   microconglomerates in the base of the mentioned limestones (boreholes B-11,   B-15, B-19, and B-21) with a total thickness of up to 15 meters. [Projekat   Ministarstva nauke Republike Srbije, br. 176015

Middle miocene badenian transgression: New evidences from the Vrdnik coal basin (Fruska Gora Mt., Northern Serbia)