Sedimentology and microfacies of the Lower Těšín Member

 

Mojmír Eliáš, Helena Eliášová

Geoscience Research Reports 34, 2001 (GRR for 2000), pages 96–98

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Abstract

The Lower Těšín Member (Oxfordian-Berriasian) is composed predominantly of dark grey limy claystone and argillaceous limestone with calcified rhaxa and spicules of sponges. These rocks belong to the spicule microfacies (SMF 1). In the succession of these rocks there are intercalations of biomicrite, biointramicrite and micrite belonging to the microfacies of "fine detrital limestone" (SMF 2) and allodapic limestone (SMF 4). These intercalations are more frequent in the upper part of the stratigraphic succession. In the uppermost part of the Lower Těšín Member massive slums bodies (the Ropice horizon up to 30 m thick and similar horizons) are developed. The Lower Těšín Member can be differentiated from the overlying beds in the area, where only the Těšín Limestone is developed (the eastern part of the Silesian unit between the Olše and Ostravice rivers). In the western part of this unit the Lower Těšín Member represents the lower part of the succession of the Těšín-Hradiště Formation.