Commune: Zbójno (pow. golubsko-dobrzyński, woj. kujawsko-pomorskie)
Framework element or context represented:
Pleistocene ice-sheet landforms.
Primary geological/geomorphological interest:
Landscape of the drummlin field.
Comparative assessment justification:
The Zbójno drumlin field is an outstanding landform. It is a best example of the typical drumlin landscape in Poland.
Protection status and accessibility:
The site should be protected of the landscape category. It offers a beautiful view, high scientific values and good sightseeing accessibility.
Character of site: Glacial landform.
Area: 1200 ha
Altitude: 75 - 115 m a.s.l.
Lithology: tills
Discipline: Geomorphology, Stratigraphy of Quaternary, Tectonics
Process Age: Quaternary, *all periods
Bedrock Age: Quaternary, *all periods
Description of primary interest:
The Zbojno drumlin field is situated within the extent of the youngest, Vistulian (Weichselian) Glaciation and is the largest in the Dobrzyń Moraine Plateau. It is located in a vast (17 x 6.5 km) depression on the moraine plateau, in hinterland of the Chrostkowo end moraines (of the Kuiavian Subphase, Vistulian Glaciation). The drumlin field occurs at 8-40 m below the surrounding plateau (104-115 m a.s.l.). In the northern part of the area, three drumlinization levels are distinguished: the lower one at 75-81 m a.s.l., the middle complex — 10 m high here. Varying azimuths of morphological axes, shapes and morphometric parameters but also a complex geological structure are typical of the drumlins in Zbójno. Glacitectonic-depositional, glacideformation-depositional and glacioerosive-depositional drumlins predominate. In the vicinity of Zbójenko their cores contain deformed glacifluvial or glacilacustrine sediments, mantled with a deformation-depositional till cover. Glacial sediments form one to two or three sedimentary till beds that belong to one or two different glacial advances.
Literature:
BER A. 1999–Preliminary list of the Quaternary geosites in Northern and Central Poland, their age and geological position. Pol. Geol. Inst., Spec. Papers, 2: 77-85 BER A. 2001–Ważne czwartorzędowe stanowiska geologiczne Polski północnej i środkowej (Polish only). In: W trosce o Ziemię. Księga ku czci Prof. S. Kozłowskiego: 224-239. KUL Lublin. LIBERACKI M. 1961–Drumlins near Zbójno. IVth INQUA. Intern. Congr. Guide-Book of Excursion. Part 1. North Poland, 115-117. OLSZEWSKI A. 1995–Zbojno drumlin field: morphology and structure of drumlins. XIV INQUA. Intern. Congr., Quaternary field trips in Central Europe, 1-210.