A Móra Ferenc Múzeum Évkönyve, 1970. 1. (Szeged, 1970)

sand-dune rows of the Danube-Tisza Interfluve Ridge, the higher ground-water table of the more humid periods gave rise to permanent, though shallow-water lakes stretching, for the most part, in NW-SE direction in correspondence with the trend of the dune rows (Fig. 2). The base of one of the groups of lakes is constituted by Latest Pleistocene loess (W

3

). This is the case, for instance, with Lake Kunfehér (/. Miháltz and M. Mucsi 1964). This loess is directly overlain by lacustrine sediment

—an evidence of the Earliest Holocene age of the lakes (M. M.-Faragó 1966). In another group of the lakes the Latest Pleistocene loess is still followed by the wind-blown sands of the pine-birch and the dry hazel-nut phases of the Holocene. Consequently, the lakes were formed and the lacustrine sediments deposited Fig. 2: Layout of Petőfi Lake at Soltvadkert and distribution of calcareous-siUy deposits (by courtesy of M. Mucsi, 1965) 1. Boreholes and geological sections, 2. subsurface range of calcareoussilty, sediments, 3. subsurface range of calcareous silts 5* 67