NOWELIZACJA STRATYGRAFII SYLURU W WYBRANYCH PROFILACH WIERTNICZYCH OBNIŻENIA BAŁTYCKIEGO (POLSKA PÓŁNOCNA)

Abstract

REVISION OF THE SILURIAN STRATIGRAPBY IN SELECTED BOREHOLES FROM THE POLISH SECTOR OF THE BALTIC DEPRESSION (NORTHERN POLAND)

Abstract. This study revises the graptolite zonation of the Silurian System in selected boreholes from the Polish sector of the Baltic Depression. The previous zonation was based on the scheme by Tomczykowa & Tomczyk (1962- 1990) and contained many errors. The revision resulted in, among others, unification of the basal and top boundaries of the Silurian System, elimination of the Siedlce series and Podlasie series, determination of limits and ranges of the standard Series (Llandovery, Wenlock, Ludlow and Pridoli) and Stages (Gorstian and Ludfordian), and relinquishment of several regional graptolite zones. Some of the zones do not posses enough attributes to allow their identification across the entire basin. For others it is impossibłe to dating their limits and ranges. Yet others are insufficiently documented, that makes them impossible to correlate with the standard graptolite zones. The modified stratigraphic scheme of the Silurian System is illustrated by borehole sections: Słupsk IG 1 ,Lębork IG 1, Kościerzyna IG 1 , Żamowiec IG 1, Gdańsk IG 1, HeI IG 1, Pasłęk IG 1 and Bartoszyce IG 1.