Istebna Beds - a fluxoturbidity formation in the Carpathian Flysch

Abstract

Warstwy istebniańskie - studium sedymentologiczne The Istebna beds (Campanian — Paleocene in the Silesian series of the Carpathian Flysch) are composed of alternating conglomerates, coarss-grained sandstones, pebbly mudstones and siltstones. Analysis of sedimentary structures, grain-size distribution, grain morphology and petrographic composition indicate that the conglomerates and sandstones were deposited mainly by sand flows, some of which developed into turbidity currents. The siltstones were deposited by diluted turbidity currents; true pelagic shales are rare. The pebbly mudstones were deposited by submarine mudflows. The Istebna beds were deposited in a trough adjacent to the Silesian cordillera which was the source of the clastic material. The various lithologic types of rocks forming the Istebna sequence are composed of material derived from different regions of the source area, were deposited by different transporting agents, and partly had different sedimentary history prior to redeposition.