Stratygrafia kredy niecki włoszczowskiej

Abstract

CRETACEOUS STRATIGRAPHY IN THE WŁOSZCZOWA TROUGH

Summary

The paper deals with the Upper Cretaceous outcrops occurring in the Włoszczowa trough. The trough constitutes the northern part of the Miechów synclinorium stretching from the Carpathians to the Baltic Sea on the south-western side of the Middle Polish anticlinorium. On the basis of the rich index fauna collected at exposures, all stages of the Upper Cretaceous, the Lower Maestichtian inclusive, have been documented apart from Albian, Cenomanian and the Lower Turonian known already previously. On the western limb of the trough the total thickness of the Cretaceous deposits amounts to 350 m, on the eastern one - 850 m. Reduction of thickness in the west is connected with a complete lack of the Emscherian deposits and a considerably lesser thickness of the Turonian and Santonian. From west to east the calcareous facies changes into marly-glauconiote, arenaceous and siliceous ones. At the time of middle Lower Maestrichtian a change of facies took place within the area considered. The change was connected with a considerable increase in supply of terrigenous material. At the Cretaceous time, the area of the Włoszczowa trough belonged to the Danish-Polish ancestral geosyncline, forming its western limb. Axis of sedimentary basin was east of the trough. The axial part constituted from Santonian up to Maestrichtian a labile area of frequent emergences in the shape of islands or peninsulas that furnished with arenaceous materials the deposits, mainly in the eastern area of the trough.