Górnomioceńskie osady ilaste Sudetów

Abstract

UPPER MIOCENE CLAY DEPOSITS OF THE SUDETESSummaryThe results of the recent geological and palaeobotanical studies demonstrate that part of the Sudetic clay deposits, thought so far to represent Quaternary ice-marginal lake clays, is considerably, older and can be referred to the Upper Miocene. These deposit rest in the northern part of the Sudetes, within a levelling plane, modified later by young tectonic movements. It has been ascertained on palaeontological analyses that the Upper Miocene clay deposits of the Sudetes facially correspond to the lower members of the Poznań series in the Fore-Sudetic block. They were formed within the intermountain basins invaded, at the time of the (Poznań series, by the sea that in this period existed in the area of the Fore-Sudetic block. This is also proved by the microorganism "Hystrix" found to occur at the sites here considered. The floristic composition ascertained in the clay deposits of the Sudetic area, determined on the basis of spore-and-pollen analysis, is, art all the site investigated, highly approximate and typical of the Younger Tertiary period.