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Table 1. Agc correlation of interglacial seas in NW Europę, SE Europę and Baltic area (acc. to Mojski 1993)

NW EUROPE (NORTH SEA BASIN)	AGE INKa	BALTIC SEA BASIN	SE EUROPE (BLACK SEA BASIN)
FLANDRIAN	7,0-0	LITORINA SEA	UPPER EUXINIAN SEA
EEMIAN	125-110	TYCHNOWY SEA	KARANGATSEA
HOLSTEIN	400-300	SZTUM SEA (DOMNOWO BEDS)	EUXINIAN UZUNLAR SEA
CROMERIAN SEAS	>500	7	TCHAUDA SEA

published a synthesis conceming the origin and evolution of the Vistula River valley during the last 15 ka. It is very important base for the recognition and a determination of lithological and facies features as well as for exemination of the interglacial thickness and fluvial deposits in the country. The results of investigations (Fig. 3) show that the average Holocene deposit thickness is 8,7 m, with increase up to 20 m maximum for smali but deep basin-like parts of valley in the former glaciated areas of Poland (e.g. Unisław Basin). The broader parts of valley floor have thickness of Holocene deposits that is only 4-5 m (e.g. Warsaw Basin).

The Holocene fluvial deposits of the Vistula River (Fig. 4) consist of min-eral-organic facies. They are mainly finegrained, except for the Carpathians. Initially the meandering type of channel prevailed, and later the deposits of braided river deposits were built up in some places. The above statements are of basie importance for the fluvial deposition in the largest valleys in the country during all interglacials. But, of course the Holocene is not yet finished as an interglacial. Therefore to the average thickness (8,7 m) we must add 2-4 m, as depositional equivalent of the futurę, younger part of each interglacial. Such a calculation is based on the of fact, that the Last (Eemian) Interglacial lasted 15 up to 20 ka.

The above described features ofthe Holocene (interglacial) fluvial deposits are a pattem for the recognition of the Pleistocene interglacial river deposits and of corresponding fluvial topography in the Polish Plain.

3. There are possible three main genetic interpretations of the great bur-ied valleys which existed in the Pleistocene cover of Polish Plain

-    The fluvial (rivers) valleys.

-    The subglacial channel.

-    The ice-marginal valleys (“pradolina”).