MALACOFAUNA OF LATE QUATERNARY LACUSTRINEDEPOSITS AT OSLONKI (KUJAWY, CENTRAL POLAND)

摘要

Successions of mollusc assemblages were described from two borehole cores drilled in thearchaeological site at Oslonki. They indicate changes of sedimentary conditions and the environment in par-ticular parts of the ancient melt-basin during Late Glacial and Holocene time. The section of lake sediments ofpre-Allered – Subboreal age, passing upwards into younger ones and deposited within swamps and marches,represents the south-western part of the basin. In the north-western part the deposition began some time later, butnot before Altered. Initially it took place on swampy and flooded meadows, which were transformed into a lakeexisting during the Early and Middle Holocene and drying up in the Late Holocene. The human impact had a sub-stantial influence on the temporary impoverishment of the mollusc fauna.