Mikrofauna cechsztyńska obniżenia podlaskiego

Abstract

ZECHSTEIN MICROFAUNA IN THE PODLASIE DEPRESSIONSummaryForaminifers and ostracods, characteristic of the Lower Zechstein stage (Zl) are discussed. Samples for micropalaeontological have been taken from bore holes made at Łochów, Tłuszcz and Łuków (Podlasie depression – East Poland). Ample microfauna has been observed to occur at the lower part of the section pierced by bore hole Łochów IG 1. The mricrofauna occurs in marly limestones that rest at a depth from 1611,5 to 1599,0 m. The fauna representatives are well preserved, the assemblage being, however, highly diversified. Here were distinguished 14 species of foraminifers and 6 species of ostracods.The article describes a new species Frondicularia permiana n. sp. and the microfauna representatives so far unknown in the area of Poland (Tab. I). The remaining bore holes Tłuszcz and Łuków reveal scarce microfauna only.It results from the previous study on microfauna of the Zechstein deposits of Poland that, in the formations of the stage Z1, both foraminifers and ostracods are abundant, in terms of individuals and of species, and make a characteristic assemblage. The deposits of the stages Z2 and Z3 reveal, however, scarce and poorly preserved fauna, or are lacking the fauna completely.