LITOSTRATYGRAFIA ORDOWIKU W OBNIŻENIU PODLASKIM I W PODŁOŻU NIECKI PŁOCKO-WARSZAWSKIEJ (WSCHODNIA POLSKA)

Abstract

LITHOSTRATIGRAPHY OF THE ORDOVICIAN IN THE PODLASIE DEPRESSION AND THE BASEMENT OF THE PŁOCK–WARSAW TROUGH (EASTERN POLAND)Abstract. Investigations of Ordovician rocks of the Podlasie Depression and Płock–Warsaw Trough (eastern Poland) have resulted in establishing and defining of 18 new formal lithostratigraphical units, including 15 formations and 3 members. Out of the units of formation rank four units have been established within the basement of the Płock–Warsaw Trough, and 11 units in the Podlasie Depression. Some of them show features of allostratigraphic units sensu “North American...” (1983) because they are bordered by sedimentary or sedimentary-erosional unconformities. The units have been defined in accordance with the rules of the Polish stratigraphic nomenclature. The description includes as follows: name, history, subdivision, type section, other sections, boundaries, lithology, organic remains and age, sedimentary environment, thickness and age equivalents. The lithology, stratigraphical position, thickness, palaeontological data and spatial relation of the particular units are presented in this paper. Rock sequences of different formations have been correlated with lithostratigraphic and genetic equivalents from the adjacent regions of Poland, Belarus, Ukraine, Lithuania and Russia (Kaliningrad District).