Występowanie otwornic ciepłolubnych w paleoceńskich osadach rejonu KisieIice

Maria Danuta Giel



The paper presents the results of micropaleontological studies carried out on Paleocene (Montian) deposits of NNE Poland, penetrated by the boreholes Szonowo 75/33, Kisielice 85/43 and Ulnowo 95/53. The top surface of Montian deposits occurs at the depth of 172.0 m (at Szonowo), 193.6 m (at Kisielice) and 218.0 m (at Ulnowo). The thickness of these deposits is unknown as these boreholes did not reach the underlying Mesozoic (Upper Cretaceous) deposits. In the profiles of Szonowo and Kisielice boreholes the Montian is overlayed with the deposits of the Late Paleocene or Eocene age (19); and in the Ulnowo profile the Paleocene is overlayed with Eocene sands (19). The deposits represent "Puławy Beds" of the Montian age. The Puławy Beds (Montian) are developed in two facies in this region, which are characterized by somewhat different foraminifer assemblages. Sandy deposits from Kisielice and Ulnowo yield the foraminifer microfauna of the Boreal type, identical as that known from Góra Puławska, Żyrzyn, Sochaczew (13), Iława (5), Olsztyn area (7, 8) as well as the Selandian of Denmark and Sweden (2) (Fig. 1). The marly-limestone deposits from Szonowo yield both the Boreal type microfauna and the warm-water foraminifer microfauna of the western-European type, known from Belgium, Netherlands and France. The latter is represented by the following species: Rosalina parisiensis d'Orbigny, Rotorbinella mariei (van Bellen), R. montiana Pożaryska et Szczechura, Rotalia marginata d'Orbigny, R. saxorum d'Orbigny, Globorotalia globigeriniformis (van Bellen), G. praepseudomenardi Hofker, Globorotalia sp., Pararotalia minimalis (Hofker), P. tuberculifera (Reuss), Bagatella aenigmatica Pożaryska et Szczechura and Globorotalia sp. The species are Iister in Fig. 2. The warm-water foraminifers found here are small, markedly smaller than those their mother province, that is, from the Montian of the western Europe. The microfauna of that type was previously described from the Paleogene (Montian) deposits penetrated by Pamiętowo borehole by Pożaryska and Szczechura (1968). The second locality of the warm-water foraminifers in the central and Northern Poland, described here, gives further evidence for the influences of the warm (meridional) basin of the western Europe, responsible for the migration of the warm-water foraminifer microfaunas into the areas of Poland.

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