Madaras László – Szabó László – Tálas László szerk.: Tisicum - A Jász-Nagykun-Szolnok Megyei Múzeumok Évkönyve 8. (1993)

Sümegi Pál: A jászfelsőszentgyörgyi szunyogos felső-paleolit telephely üledékföldtani és sztratigráfiai elemzése

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с% Fig. 5. Isotope analysis date of carbonate content in sediments represented on the MANZE diagram (Manze et al. 1974) med in the driest, coldest climatic phases. On the basis of isotope displacement data and of its stratigraphic position the time of the formation of the loessy sequence was most probably the Late Glacial period. Stratigraphic evaluation of the excavated sequence A fluvial sequence of sediments is the underlying layer in the sedimentary environment of the Upper Paleolithic settlement. On the basis of paleontological investigations made on the crossbedded gravelly channel-deposits excavated in the Jászfelsőszentgyörgy sand-pit this fluvial sediment had been accumulated In the area at the end of Middle Würm (Sümegi P. 1991). The movement of drift-sand which resulted in the formation of the dune is younger: its age is 5. ábra Az üledékkarbonát izotópos elemzési adatai a MAN ZE-féle (Manze U. et al. 1974) diagramon the Upper Würm. From a thin clayey silt layer at the top of the dune (Fig. 4., 0,7-0,8 m) and from the Upper Paleolithic settlement excavated at Its boundary bones of game animals came to light. The radiocarbon age of these bones is 18.500 ±400 BP. (Recent developments in the Isotope Laboratory of the ATOMKI at Debrecen made possible to do the radiocarbon analyses). (Hertelendi E. et al. 1989). According to our opinion the dune produced by drift sand movement is older than the above date. The radiocarbon analyses demonstrate that the accumulation of sand took place in the area between 18.000-30.000 BP. On the basis of data in literature (Borsy Z. 1987, 1989) we know that the periods in which paleoecological conditions favourable for sand drift development in Hungary existed were those between 22.000-26.000 BP and between 18.000-20.000 BP. Ön the basis of our investigations the dune under the Upper Paleolithic settlement had been developed most probably in these perids. 69