Foraminiferal assemblages and facies change in the Cretaceous flysch of the Nysa Graben (Sudety Mountains)

Abstract

Wpływ zmian facjalnych na zespoły otwornic we fliszu kredowym Rowu Nysy (Sudety) A gradual increase in the amount of sand transported to the sedimentary basin by turbidity currents caused some facial changes within the lower Idzików beds (formation); the pelagic deposits in the Nysa Graben area were followed by normal and clayey flysch. Along with the facial changes, there has been detected a gradual increase in amount of benthonic Foraminifera paralleled by a decrease in the number of planktonic forms, and the appearence of primitive forms characteristic of flysch basins, among arenaceous Foraminifera.