8th International Nannoplankton Association Conference


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Ines Galovic, Georg Koch, Josip Benicc:
Middle Miocene phytoplankton zones in Markuševec area (Mt. Medvednica, Croatia)

The Markuševec section, 26m long, comprises Badenian, Sarmatian and Pannonian age beds. Five lithofacies units were distinguished in the succession: 1) massive marl; 2) coatical gravels; 3) graduated sands; 4) laminated and clay-layered marls and clay; and 5) layered limestones. The attention of this work is paid to palaeontological analyses and determination of phytoplankton (coccoliths, diatoms and silicoflagellates). Out of 11 samples from the section, particular palaeoecologic and biostratigraphic results have been achieved. The stratigraphic position of the Badenian beds is based on coccoliths and is dated as the Sphenolithus heteromorphus Biozone (NN5). The silicoflagellates of the Sarmatian beds represent the Distephanus longispinus Biozone, which is equivalent to the Coscinodiscus plicatus Diatom Biozone. The domination of diatoms in the upper layers of the Sarmatian is the result of shallow water. Low diversity of foraminiferal and mollusc species indicates a permanent decrease in salinity. The abundance of D. crux forms in Sample 10 suggests a nearshore, temperate environment with seasonal changes of climate ('varva' sediments) and reduced upwelling in warmer periods.


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 [Division of Micropalaeontology] [Department of Geosciences] [Bremen University]

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