The stratigraphy and tectonics of the Uppermost Silurian and Lower Devonian of the Zdanów Section (Góry Bardzkie Mts, Sudety Mts) in the Light of Conodont Studies

Abstract

 In the Zdanów section, up to the present there were known two horizons of graptolite shales with paleontological record and light-coloured, faunistically barren clay shales separating them. Conodonts recently found in the clay shales made it possible to establish their stratigraphic position. There was also found a third horizon of graptolite shales and, thus, the Middle Zdanów Shales. The Silurian/Devonian boundary presumably passes within the Middle Zdanów Shales. The Zdanów section represents reversed and latter refolded Ordovician-Lower Devonian sequence. Strata exposed here may be assigned to the Bavarian facies, widely distributed in the Sudety Mts (Góry Bardzkie and Góry Kaczawskie Mts). At Zdanów, deep-water marine sedimentation has been accompanied by volcanic phenomena in the Wenlockian and Lower Gedinnian times.