Mikrofauna z warstw krośnieńskich w Leszczawie Górnej na południe od Przemyśla

Stefan Gucik, Janina Morgiel



In view of the opinion expressed by V. O. Szakin (1958), S. Jucha, J. Kotlarczyk (1958), and L. Koszarski, K. Żytko (1958) that the boundary between the Menilite series and the Krosno beds extends obliquely, the authors consider it possible now to overcome the heretofore existing difficulties in establishing both the age and the subdivision of the Krosno beds. Due to this, the palaeontological documentation of the horizon of the Jasło shales is bound to be of prime importance.

In their descripion of theMenilite - Krosno series the authors distinguish such beds as: the Globigerina marls, the Subhornstone strata, the hornstones, the Menilite shales, the Kliwa sandstones, and the Jasło shales which, in the upper part of the latter formation, appear as an intercalation of several centimeters thickness; subsequently the thick bedded lower Krosno sandstones, a compact block of, Krosno shales in which the described microfauna occurs, as well as corrugated sandstones, and pIaty sandstones with shales. The deposit in which the microfauna has been found, shows the features of mud flow. Besides this microfauna there appear destroyed shells tests of pelecypods and gastropods, bases of spines and spines of echinoids, bryozoans and otolithes of fishes. The foraminifer association is copious, consisting chiefly of calcareous forms, whereas agglutinating foraminifers occur but very rarely. Of 94 species, 6 belong to the agglutinating foraminifers, with one or two representatives of each species. Upon the attached diagram (Fig. 3) there is presented the stratigraphical value of the discovered foraminifer species, and the quantitative, analysis of the association found in the investigated samples. Of the total number of 86 species, to the Oligocene should be ascribed 13, for the period from the Cretaceous and the Older Ternary to the Oligocene; from the Oligocene to the Miocene and to modem species - 12, and of long-lived forms, from the Cretaceous and the Older Tertiary up to modern forms - 30.

The microfauna from Leszczawa Górna bears closest resemblance to the microfauna from the lower part of the Krosno beds from Węglówka, investigated by F. Huss; it does not look like the microfauna from the lower Krosno beds investigated by Maslakowa (1955).

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