- Pozycja stratygraficzna serii górnokarbońskiej z otworu wiertniczego w Rybnie na Dolnym Śląsku

Teresa Górecka

Abstrakt


STRATIGRAPHIC POSITION OF UPPER CARBONIFEROUS SERIES IN BORE HOLE AT RYBNO, LOWER SILESIA

Summary
The article sums up the results of the palynological examinations made of series of the Upper Carboniferous strata pierced by a bore hole at Rybno, Nowa Ruda district (Wrocław province). The following are more important conclusions that result from the examinations considered: 1. The formations drilled through from 190,00 to 1251,5 m should be thought to represent a series of Upper Carboniferous strata, in contrast to the Permian age so far accepted. 2. The sporomorphs found to occur in the deposits examined show that we have to do here mainly with the forms known to appear in both Intra-Sudetic and North-Sudetic troughs, and with the microflora described from other Carboniferous areas and from the USA. 3. A comparison of the startigraphical evidences from various depths of the bore hole Rybno S 5 markedly demonstrates that the differences in the above spore-and-pollen assemblages of the startigraphical horizons distinguished palynologically are not so considerable. 4. Individual index species that occur on the background of numerous long-lived forms little by little disappear, replaced by those characteristic of the lower horizons. This monotony points to a continuous sedimentation of Upper Carboniferous part examined. 5. According to the microfloristic analysis the following startigraphical horizons are found to occur in the area of the bore hole Rybno S 5: a – from 180,00 to about 254,00 – Upper Stephanian determined on palynological evidences, b – from 254,30 to 701,70 m – a series without palynological data, c – from 701,70 to 749,70 – the oldest Stephanian or uppermost Westphalian D, determined on palynological data. This part no doubt makes a transition zone between the Upper Westphalian and Stephanian, d – from 749,70 to 810,00 m – deposits that do not contain any microfloristic evidences, e – from 810,00 to 940,40 m – an assemblage of sporomorphs represented mainly by long-lived forms that do not allow this series to be subdivided into horizons, f – from 940,40 to 1251,50 m – deposits that do not show any distinct palynological differentiation. The assemblage is quantitatively fairly rich but, as concerns its composition – is very monotonous. No doubt, it is of Westphalian age. On the basis of the sporomorphs encountered, and of its resemblance to the spore-and-pollen assemblage of the Orzesze Beds, it should be referred to Westphalian B. The palynological results presents above allowed the author to ascertain, for the first time in the Intra-Sudetic trough, a continuity of the Upper Carboniferous series from Westphalian B to Upper Stephanian.

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