New findings of the Oslo region erratics in glaciofluvial deposits of NW Poland

Abstract

Glacial erratics of the Oslo region are only occasionally found in Poland. This is because the Norwegian Channel ice stream did not reach this area. Recently a few specimens of rocks representing Oslo region have been found at the Owczary site (north-western Poland), what raised questions regarding the relative age of the deposits, as well as the depositional history of the erratics. The questions were addressed using lithofacies analysis, as well as structural and textural analyses, combined with clast petrography (medium and coarse gravel). Clast petrography analysis revealed that the deposits containing rocks of the Oslo region are of the late Saalian age (Warthe), though some evidence suggest the early Saalian age (Drenthe).