Pozycja stratygraficzna warstw z Kotowic

Abstract

STRATIGRAPHIC POSITION OF THE KOTOWICE BEDS Summary The paper presents evolution of views on age of rock sequences forming Caledonian structural stage at NE margin of the Upper Silesian Coal Basin. A special attention is paid to the question of age of the Kotowice Beds, encountered in a number of drillings of the Geological Institute in the years 1972-1979. Poorly preserved fragments of rhabdosomes of graptolites and remains of brachiopods. bivalves and cephalopods were recently found in core material from two of these boreholes, 41 Ż and 31 KW (Fig. 1). The drilling 41 Ż penetrated Triassic LO enter grey-green shales yielding Bohemograptus bohemicus (Barr.), Bohemograptus bohemicus tenuis (Boucek) and Pristiograptus aff. dubis (Suess) and other fossils in core material from the interval 250.9 -280.5 m. The identified graptolite assemblage generally indicates Middle Ludlovian age of the rocks. In turn, in sequence of grey shales encountered at depth of 533.0 m in the drilling 31 KW there was found Pristiograptus aff. dubius (Suess), the stratigraphic range of which comprises Wenlockian-Ludlovian.