Górny malm na obszarze Kujaw

Jadwiga Dembowska

Abstract


UPPER MALM IN THE AREA OF KUJAWY

In the area of Kujawy, between Toruń and Ozorków, near Łódź, the deposits of the Upper Malm are found to be completely developed (Fig. 1).

Lower Kimmeridgian consists of light grey and grey marls and marly limestones, revealing in the northern part an admixture of siltsrones, locally also intercalation of oolite limestones. In the upper portion of these deposits are found intercalations of shell limestones containing Nanogyra nana (Sow.) and Exogyra virgula (Defr.). In the northern part of the area some ammonites of the genus Ataxioceros and Rasenia have been founud in the deposits here cosidered. The microfauna assemblage is characteristic of the Lower Kimmeridgian in particular, however, the following foraminifers are typical here: Epistomina nuda Terq. var. vulgaris Biel. et Poż., Flabellimina jurassica Mjat., Frankeina kimmeridensis Biel. et Poż. and Spirillina. elongata Biel. et Poż. In the south of the area the thickness of the Lower Kimmeridgian deposits amounts to 120-180 m, and in the north, vicinities et Ciechocinek, to 40-60 m (Fig. 2).


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