Sytuacja geologiczna osadów interglacjału eemskiego w Gołkowie koło Warszawy

Abstract

GEOLOGICAL SITUATION OF THE EEMIAN INTERGLACIAL DEPOSITS AT GOŁKÓW, NEAR WARSAW

In the vicinity of Gołtków a series of organic deposits occurs amounting to 6,5-9,3 m in thickness, and consisting of oil shales, lacustrine silts and sands, as well as peats and peaty silts. The organic deposits fill up an old, small, but fairly, deep lake basin, probably of finger-lake origin. It may be seen to-day as a slight lowering of the relief, filled up with soaked ground, stretching from north to south.

On the basis of palaeobotanical examinations the organic deposits considered are of Eemian interglacial age (Z. Janczyk-Kopikowa, 1963).

The lower part of the organic series consists of a compact oil shale horizon, the maximum thickness of which may attain up to 8 m. The oil shales contain, particularly in their upper part, numerous intercalations of arenaceous silts, dark grey or black in colour, or of sands mainly of lacustrine provenance. At the top of the oil shales are found peats, up to 2,5 m in thickness, covered by black, humus silts with numerous plant remains.

The Eemian Interglaciai deposits are covered by a series of fluviatile sands belonging partly to the Baltic Glaciation (bottom part of the series), partly to the Holocene (top part of the series). The thickness of the sands is 0,5-3,7 m. Higher up, there are found the Holocene and present-day deposits developed as clayey alluvion, or arenaceous slide rocks or arenaceous-silty soil.