engleski

Siliceous phytoplankton assemblage from Sarmatian beds in the Markuševec area (Mt. Medvednica, NW Croatia)

The section of sedimentary profile that has been investigated is located on the southwest part of Mt. Medvednica, in the Markuševec area. This paper focuses on paleontological analyses and the identification of siliceous phytoplankton (silicophlagellates, diatoms) composition of Sarmatian sediments (marls, clays) in the geological column Mrzljak. The Distephanus longispinus Zone has been proposed, on the basis of the silicoflagellate index taxa and their assemblage, for the upper part of the Middle Miocene. Fourteen diatom species have been found for the first time in this region (on the base of available literature) Coscinodiscus rothii (Ehrenberg) Grunow, C. subtilis Ehrenberg, Actinoptychus senarius (Ehr.) Ehrenberg, A. heliopelta Grunow, Actinocyclus octanarius var. tenella (Brebisson) Hendey, A. tenellus (Breb.) Andrews, Anaulus simplex Hajós, Bacteriastrum varians Lauder, Grammatophora macilenta var. subtilis Grunow, Cocconeis scutellum var. scutellum Sheshuk, Diploneis subovalis Cleve, Navicula marina Ralfs, Nitzchia imperforata Andrews and Delphineis lineata Andrews. A few ebridians, such as: Hermesinum adriaticum Zucharias, Ebria triparita (Schum.) Lemmermann, Cardiuifolia gracilis Hovasse and Ammodochium prismaticum Hovasse, and one endosceletal dinoflagellate Actiniscus pentasterias Ehrenberg were determined.

silicoflagellates ; fossil diatoms ; Sarmatian ; Markuševec ; Croatia

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