Middle Miocene calcareous nannoplankton from the southern Pannonian Basin (Bosnia and Herzegovina)

摘要

Paleoenvironmental analyses based on calcareous nannoplankton and foraminiferal distribution were carried out on samples from a locality at the village of Bogutovo near Ugljevik. During the middle Miocene, the region was positioned on the southern margin of the Pannonian Basin and the Central Paratethys Sea. The studied section is a sedimentary succession that is dominated by marine marls with a single limestone package near the middle. Samples from borehole UI568 were also studied. All assemblages are dominated by small reticulofenestrids, with lesser numbers of Coccolithus pelagicus, Helicosphaera carteri, H. walbersdorfensis, Holodiscolithus macroporus, Reticulofenestra gelida,R. pseudoumbilicus, Sphenolithus moriformis, and Umbilicosphaera jafari. Braarudosphaera bigelowii, Calcidiscus leptoporus, Coronocyclus nitescens, Coronosphaera mediterranea, Cyclicargolithus floridanus, Geminilithella rotula, Pontosphaera multipora, Rhabdosphaera sicca, and Syracosphaera pulchra are rare but continuous in occurrence.