Fitostratygrafia najwyższego odcinka profilu karbonu produktywnego Górnośląskiego Zagłębia Węglowego

Abstract

W oparciu ci badania własne i analizę materiałów archiwalnym i publikowanym przedstawiono zespół flory występujący w warstwach libiąskich' karbonu Górnośląskiego Zagłębia Węglowego. Zespół ten zawiera wiele form dotychczas nie cytowanych i pozwala na sformułowanie wniosku o przynależności warstw libiąskich (od pokładu 119 do pokładu 110) do westfalu D. Skok florystyczny na granicy warstw chełmskich i libiąskich znamionuje lukę stratygraficzną obejmującą szczytową część westfa1u C.PHYTOSTRATIGRAPHY OF THE UPPERMOST PART OF COAL MEASURES SECTION IN THE UPPER SILESIAN COAL BASINThe paper presents floral assemblage occurring in the Libiąż Beds of the Carboniferous of the Upper Silesian Coal Basin (sean 119 -110, inclusively). The assemblage comprises several forms hitherto not described in the literature. The analysis presented here is mainly based on tilt. author's data and critical review of both published and unpublished reports.Floral assemblage of the Libiąż Beds comprises 81 species a arborescent and herbaceous pteridophytes, proper and seed ferns and cordaites. Several of these species are long-ranging and appear as -early as the Namurian (A. B or C) in the Upper Silesian Coal Basin, whereas others appear for the first time in the Westphalian A, B or C. The species first appearing in the Westphalian C include Neuropteris scheuchzeri, Linopteris oblique, Dicksonites potieri, Desmopteris longifolia, Sigillaria brardi and especially Neurupteris ovata which is common m the seams 119 - 113. Here also appear for the first time the species typical of the Westphalian D, the bloom of which coincides with the Stephanian and Permian: Dicksonites plueckeneti, Pecopteris cyathea, P. hemitelioides, Alethopteris costei, A. grandini, Sphenopteris rotundiloba, as well as Pecopteris polymorpha, P. bredovi and Dicksonites sterzeli.The floral assemblage a the Libiąż Beds is clearly younger than that of underlaying Chełm Beds, despite of still present floral elements of the Westphalian C. The Westphalian D age of the former is evidenced by the presence of Neuropteris ovata and accompanying younger forms. The sudden appearance of new species is additionally emphasized by the fact the floral assemblage of the underlaying Chełm Beds is very close to. that of the Westphalian B and with poorly represented elements of the Westphalian C. This would suggest that the Westphalian C is not fully developed in the Upper Silesian Coal Basin. The abrupt floristic change at the boundary of the Chełm and Libiąż Beds indicates a stratigraphic gap comprising top part of the Westphalian C.