Stratygrafia i litologia mineralnych osadów występujących w klifach środkowej części polskiego wybrzeża Bałtyku

Korzystając z dawnych i nowych opracowań geologicznych oraz własnych danych petrograficznych i stratygraficznych, autorzy przedstawili swoje poglądy na temat litologii i wieku osadów mineralnych budujących klify pomiędzy Jarosławcem a Dębiną. Najnowsze dane odbiegają od zakorzenionych w literaturze poglądów.

New views about lithology and age of deposits building coastal cliffs between Jarosławiec and Dębina, diverging from the models rooted in the literature, are presented by the authors. The revision is based on critical re-assessment of older and more recent geological reports and new results of petrological and stratigraphic research. The oldest glacial deposit exposed in cliff sections is grey till. Petrological data and TL dating results indicate clearly that it was deposited during the Świecie stadial. At Jarosławiec site, the till is enriched in Tertiary organic material and divided into two layers based on colour. However, petrology and TL age determinations do not differ between these layers. In the cliffs investigated, as well as in the other coastal cliffs in the eastern Pomorze region, older tills do not occur. Likewise, tills from the main stage of the last glaciation have not been recognized. The Świecie stadial till is overlain by outwash, glacilimnic and limnic deposits, the latter dated for the Grudziądz interstadial. Almost everywhere the near-surface layer is built of late Holocene aeolian sand with palaeosols.