Wyniki badań mikroflorystycznych permo-karbonu między Jaworem a Lubaniem

Abstract

RESULTS OF MICROFLORISTIC RESEARCH OF PERMO-CARBONIFEROUS DEPOSITS FOUND IN THE AREA BETWEEN JAWOR AND LUBAŃ

Summary

The article presents the results of palynological examinations carried on the materials from bore holes made in the North-Sudetic trough at Uniegoszcz, Wolbronów, Lipa Jaworska and Jastrowiec (Fig. 1). The microfloristic material was obtained from samples of clayey and clay-sandy rocks after maceration in hot HF. The examinations proved the presence of sporomorphs characteristic of the Upper Carboniferous (Stephanian ABC), and the Lower Permian (bore hole Lipa Jaworska).

The results of these examinations are presented in Tables l­–3. The assemblage of the sporomorphs encountered differs in its morphology from that of the microflora of the Carboniferous lower horizons, and points to the fact that the vegetation of that period developed under conditions, different from those of the time of the older horizons. Maybe the differences were mainly due to climatic changes which, most probably, took place at the close of the Upper Carboniferous time.
Taking into account the fact that most species of the sporomorphs found to occur in the samples examined are represented by thick-coated (forms of large sizes (80% of them are about 1/3 to 1/2 larger than those characterized by the sizes determined in diagnoses of the individual species), we may suppose that due to the highly unfavorable conditions for vegetation and mutation of plants, these latter must have changed their life system, producing polyploidal spores, which, most probably, were better adapted to the changing and unfavorable conditions . Table, 3 presents the results obtained on the basis of the interpretation of the microfloristic associations that appear at the given depths penetrated by the bore holes under examination. Key species that occur in the background of a considerable amount of long-lived forms little by little disappear, giving way to the others, characteristic of the lower horizons. Such a monotony corroborates the sedimentary continuity of the Upper Carboniferous series in study. It may be accepted on the results of the research so far carried on that the sedimentation of the Upper Carboniferous deposits in this area began not earlier than at the Stephanian.
A mass appearance of monosaccate pollen grains in the Stephanian C, and the characteristic differences in sizes of their grains may, most probably, be related to an unfavorable variation in ecologic conditions caused by climatic factors.