OAZ

Based on the distribution of ostracod species and molluscs, nine ostracod assemblage zones (OAZ) were distinguished (Figs 4.6; Table 2).

The anomalous level in the glaciolacustrine clay of PE-2 (OAZ 0) is characterized by a high faunal diversity and ostracod content (Fig.

The interval of high abundance of ostracods in the sediment sequences of PE-1 and PE-2 starts in sandy silt deposits (OAZ B, Figs 4 and 5), although generally the high sand fraction content related to a higher sedimentation rate seems to dilute the actual microfaunal content.

reptans preferring higher water energy, has obviously occurred twice, first during the period when sandy silt accumulated in PE-2 (OAZ C1), and secondly in the middle of the lake marl interval where H.

stevensoni at the beginning of lime accumulation in PE-1 and PE-5 (OAZ C1), refers to the possible water depth shallower than 4 m (Niinemets 1999).

An exceptional interval (OAZ D) could be distinguished in the PE-2 sediment sequence where the presence of H.