Wstępne wyniki badań mikroflory stycznych nad pozycją stratygraficzną łupków antrakozjowych (depresja śródsudecka)

Abstract

PRELIMINARY RESULTS OF MICROFLORISTIC RESEARCH ON STRATIGRAPHICAL POSITION OF ANTHRACOSIA SHALES (INTRA-SUDETIC DEPRESSION)SummaryThe paper presents the results of palynological research on the beds of fine-grained sandstones, siltstones and shales, found to occur within the coarse-clastic deposits of the uppermost Upper Carboniferous and the Lower Rotliegendes in the Intra-Sudetic depression.These beds are presented on geologic maps as continuous stratigraphical horizons, and traditionally are called Antracosia shales.Samples for analyses have been taken at exposures in the vicinity of Unisław, Rybnica, in the test pits made in the vicinity of Nowa Ruda, and from bore hole Słupiec I {Fig. 1). Microfloristic assemblage ascertained in the samples from the above localities is presented in Polish text. Quantitative analysis has been made to determine the frequency of genera in the spore-and-pollen assemblage in study. It appears that in samples taken at four of the localities under consideration the same genera predominate (Fig. 2). Interesting is here the marked predominance of sporomorphs with single scars over trilete spores. Very characteristic, though sporadic is the occurrence here of two-sac pollen grains - Aumancisporites and Pityosporites. As concerns the quantitative share of the individual genera, the assembllage under discussion is closely related to the Autunian-Stephanian assemblages from the French Coal Basin (J. J. Liabeuf, B. Alpern, 1969). A similar assemblage had been ascertained by M. Kalibova (1963, 1967, 1970) when drilling within the Bohemian Massif area, in the vicinity of Kladno, Rakovnik, Pilzno and Očelice. The spore-end-pollen assemblage from the Anthracosia shales allows these deposits to be referred to the Autunian-Stephanian. Both microfloristic and macrofloristic data have been a basis to distinguish here the Autunian-Stephanian deposits. The macroflora of the Anthracosia shales is among others represented by Callipteris conferta Brogn., and Odontopteris subcrenulata (Rost.) Zeill. The microflora, in turn, consists here of the genera known to occur in both Stephanian and Autunian. The percentage of the genera, the maximum development of which falls at the Autunian time, is considerable. Florinites, Potonieisporites, Wilsonia and Aumancisporites occur in the amounts from 48 to 50 per cent. Mareover, sporadically we found also Nuskoisporites and Pityosporites, thought by D. C. Bhardwaj and B. S. Venkatachala (1957) to be genera typical of the Autunian. Thus, one can accept that the Autunian-Stephanian assemblage, found to occur in the Anthracosia shales within the Intra-Sudetic depression, is related to the Permian flora rather than to the Carboniferous one.