Eocene in Mielnik on the Bug River

Zdzisław Krzowski


Until now in Mielnik on the Bug River residual clays deposited on the chalky limestone of the Upper Cretaceous period have been included in the Eocene. However, lying on top of them quartz-glauconitic sands containing phosphorites belong to the Oligocene. Radiometric dating of glauconite from sandy-glauconitic series showed its Eocene age (41.7±O.4 Ma) which indicates that the Eocene deposit boundary reaches higher than previously thought and that it also comprises of the quartz sands containing glauconite and phosphorites. Dated glauconite has been investigated with respect to its physical, mineralogical and chemical features using X-ray diffraction, thermal and chemical analysis. These studies indicate that the tasted glauconite exhibits a mature nature with a high potassium content and an ordered and well developed structure. All these factors qualify this glauconite for farther geochronological studies. The mineral composition and petrographic features of the Upper Cretaceous rocks exposed in Mielnik have been determined by microscopic and X-ray diffraction studies.

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