On the stratigraphy and lithology of the flysch zone in the surroundings of the Hagenbach-Valley (Northern Vienna Woods, Austria)

Abstract

Über die Stratigraphie und Lithologie der Flyschzone in der Umgebung des Hagenbachtales (nördlicher Wienerwald, Österreich) This study on the stratigraphy and lithology of the flysch sediments of the Hagenbach area is supplementing the paleontological papers in this volume by W. Grün and H. Stradner. The topographical and tectonical chapters are followed by the detailed descriptions of those outcrops which are treated in the paleontological papers. The mapping by 'the author resulted in the establishment of a system of tectonic slices in the northernmost tectonic unit of the north-alpine flysch zone („Greifensteiner Schuppenzone”). The northernmost lowest slice shows a Stratigraphie profile ranging from the Lower Cretaceous Wolfpassing Beds to the Upper Greifenstein Beds (upper part of the Lower Eocene). A lower and an upper complex can be distinguished within the Greifenstein Beds. Between these complexes a minor tectonic phase can be assumed. The sedimentological study of the heavy mineral contents proved furthermore, that a structural Stratigraphie hiatus lies between the Wolfpassing Beds and the Wörde,rn Beds. Within the Altlengbach Beds a gradual change of the heavy mineral associations can be observed. The Lower Greifenstein Beds are conformably overlying the Altlengbach Beds and show similar heavy mineral associations. The Upper Greifenstein Beds lying in structural discordance over them indicate a new cycle of sedimentation. Determinations of the carbonate contents supplement the data of the lithology. In Upper Cretaceous and Lower Paleogene sediments flysch facies is predominating, as can be proved by cases of graded bedding and convolute bedding. The relation of quartz arenites to clays and clayey marls in the average is 4 : 1 (Upper Cretaceous to Lower Eocene) in the Hagenbach Area.