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

Fig. 7: Layout of Lake Dongér, geological formations of its vicinity, location of boreholes, and geological section lines (B. Molnár, M. Mucsi and L. Magyar, 1969). (For legend, see Fig. 3.) time become lower in altitude (relatively „subsided") and the waters left over there have accumulated in intermittent shallow-water lakes. The granulometric curves of the sediment types deposited in the vicinity of Lake Dongér are shown in Fig. 8b). Lake Dongér has been formed in the same way at the intersection of the sand jidge of the Danube-Tisza Jnterfluve and the Tisza Valley (Fig. 7). Just like Lake Dongér, the lakes of the Tisza Valley are of irregular shape. HYDROGEOLOGY OF THE LAKES A common characteristic of the natron lakes of the southern Great Hungarian Plain is that their waters are shallow, attaining a maximum of a few decimeters in depth. Under natural conditions every lake is supplied by local-depression-bound ground-waters and by meteoric waters. Ground-water flow is illustrated well by the ground-water map of the vicinity of Lake Fehér at Kardoskut, showing the conditions of high springtime water level, 74