Przegląd wyników badań makrofauny z serii parallcznej (namur A) południowej cz,ści G6rnośl~kiego Zagłębia Węglowego
Abstract
A REVIEW OF STUDIES ON MACROFAUNA FROM THE PARALIC SERIES (NAMURIAN A) IN SOUTHERN PART OF THE UPPER SILESIAN COAL BASIN
Summary
Drillings recently made in southern part of the Upper Silesian Coal Basin the blanket and younger members of the Carboniferous and a part or the w hole section of paralic series of the Namurian A, relatively rich in faunistic material. Complete section of the paralic series, i.e. rocks from the base of coal seam 510 (Namurian B) to the top of marine horizon Stur (XVI, lower part of the Namurian A) is here about 700 m thick. It follows that it is strongly reduced in relation to that from northern part of the Basin. Some stable marker marine horizons were found in these rocks, making possible subdivision of the series into the Pomba, Jaklovec, Hrufov and Petrkovice Beds (Figs. 1, 2).
In the Pomba Beds, the faunistic Barbara horizon (V} is most stable and the richest in both number of species and individuals. The remaining horizons, I - IV, are relatively impoverished in fauna. They are most always marine in character due to appearance of freshened-water rock packets with fresh-water or brackish fauna.
The Jaklovec Beds, delineated by marine horizons Barbara (V) and Enna (VII), are markedly reduced in thickness and faunistically barren (except for borehole column Piasek IG 1).
In the Hrufov Beds,. two marine horizons, were found : Enna (VII) at the top and Franciszka (X) in their lowermost part. Fresh-water and brackish intercalations occurring between the two horizons represent time equivalents of the Carbonicola as well as Bezimienny (VIII) and Roland (IX) horizons. In the lowermost member of the paralic series, the Petrkovice Beds, marine fauna is missing and only intercalations yielding fresh-water bivalves have been recorded. The studied material made possible more detailed reconstruction of distributions and development of faunistic horizons in this part of the Basin as well as possibilities of their correlation. The studies also showed possibilities to correlate them with those from NE region of the Upper Silesian Coal Basin as there appeared similarities in faunal assemblages of the marker horizons, distribution and number of marine horizons, and facies development and thickness of beds. The correlation is shown in profils running along SW - NE line, from Cieszyn to Maczki (Fig. 1).
Summary
Drillings recently made in southern part of the Upper Silesian Coal Basin the blanket and younger members of the Carboniferous and a part or the w hole section of paralic series of the Namurian A, relatively rich in faunistic material. Complete section of the paralic series, i.e. rocks from the base of coal seam 510 (Namurian B) to the top of marine horizon Stur (XVI, lower part of the Namurian A) is here about 700 m thick. It follows that it is strongly reduced in relation to that from northern part of the Basin. Some stable marker marine horizons were found in these rocks, making possible subdivision of the series into the Pomba, Jaklovec, Hrufov and Petrkovice Beds (Figs. 1, 2).
In the Pomba Beds, the faunistic Barbara horizon (V} is most stable and the richest in both number of species and individuals. The remaining horizons, I - IV, are relatively impoverished in fauna. They are most always marine in character due to appearance of freshened-water rock packets with fresh-water or brackish fauna.
The Jaklovec Beds, delineated by marine horizons Barbara (V) and Enna (VII), are markedly reduced in thickness and faunistically barren (except for borehole column Piasek IG 1).
In the Hrufov Beds,. two marine horizons, were found : Enna (VII) at the top and Franciszka (X) in their lowermost part. Fresh-water and brackish intercalations occurring between the two horizons represent time equivalents of the Carbonicola as well as Bezimienny (VIII) and Roland (IX) horizons. In the lowermost member of the paralic series, the Petrkovice Beds, marine fauna is missing and only intercalations yielding fresh-water bivalves have been recorded. The studied material made possible more detailed reconstruction of distributions and development of faunistic horizons in this part of the Basin as well as possibilities of their correlation. The studies also showed possibilities to correlate them with those from NE region of the Upper Silesian Coal Basin as there appeared similarities in faunal assemblages of the marker horizons, distribution and number of marine horizons, and facies development and thickness of beds. The correlation is shown in profils running along SW - NE line, from Cieszyn to Maczki (Fig. 1).