Paleoecological evaluation of the fossiliferous layers of Upper Badenian at the Dubová site (northwestern part of the Danube basin)
Vol.31,No.1-2(2024)
The Miocene sediments at the foothills of the Malé Karpaty Mts. are often rich in fossils,
temporary outcrops are often not documented yet. This work presents findings from
a construction pit southwest of the Dubová village, excavated during the construction
activities. We have documented the fauna and flora of the marginal marine sediments of
the Upper Badenian (Lower Serravallian) within the NN6 Zone and the Ammonia beccarii
eco-biozone, which is the lateral equivalent of the Bulimina–Bolivina Zone. We interpret
paleoenvironmental changes during sedimentation based on the diverse association of
calcareous nannoplankton, foraminifera, corals, molluscs, and bryozoans. In a relatively
short period, represented by a 2.5-meter-thick profile, we identified various types of paleoecological
environments influenced by changes in salinity, nutrient input, and aquatic
dynamics. The entire profile suggests a very shallow water environment, maximum up to
40 m, alternating episodes with low oxygen content (predominance of the Ammonia genus),
likely influenced by the environment‘s energy. During sedimentation, the salinity gradually
transitioned from marine, indicated by foraminifera (Elphidium, Borelis) and bryozoans
Cupuladria and Reussirella, to hyposaline, marked by the presence of molluscs Vitta and
Pustulosia towards the overlying bed. The water column documents a coastal environment
of the outer shelf, and the high abundance of reworked calcareous nannoplankton of the
Cretaceous and Paleogene suggests contributions from the paleo-Váh River.
Middle Miocene, Badenian, Central Paratethys, Northern Danube Basin, Nannofossils, Foraminifera, Mollusks, Bryozoa
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