Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 41. (Budapest 1948)
Szurovy, G.: Geological structure of the Southern part of the Great Hungarian Plain
//// ximately 8,530 ft, the flanks of which dip at S— 4° (Figure 9—10). The well Ferencszállás 1. had to be abandoned at a depth of 8,441.9 ft due to technical difficulties in the Lower Pannonian lime marl. 3. Sándorfalva. The structure of Sándorfalva constitutes in its gravity picture an extensive flat shield (Fig. 11). Seismic measurements did not reveal any elevation or anticline, and, therefore, strengthened the supposition that the substructure lies at considerable depths (9,800 ft). Therefore, the structure may be interpreted only as a deep-seated gravity anomaly respectively as a regional effect in gravity. (Fig. 12.) The well Sándorfalva had to be abandoned for technical reasons at a depth of 6,546 ft in Lower Pannonian marl clay. 4. Madaras. The structure Madaras-Tompa is the most significant elevation which had been found in the whole Plain (Fig. 13). The gravity picture shows an extensive structure with steep flanks and a SW — NE striking trend. The seismic measurements showed at a depth of approximately 754.5 ft, a strongly reflecting bed, which was first interpreted as the basement rock. For this reason, the well Madaras 1. was started with a medium outfit (Fig. 14—15). But the refraction measurements showed that the reflecting area belonged only to the 4,000 meter per sec. travel time zone, which from experience corresponds to tertiary sediments. The basement rock with its 6,000 meter/second velocity has to be looked for at a depth of approximately 2,600—3,300 ft. The well Madaras 1. most probably reached at a depth of 754.5 ft a Mediterranean conglomerate, and drilling had to be abandoned at a depth of 987.5 ft. 5. Biharnagybajom. The structure of Biharnagybajom is also rather extensive as it has a striking trend from SW to NE (Fig. 16). The seismic measurements proved the gravity meter findings (Fig. 17). There is here an elevation of the basement rock from 8,200 to approximately 3,300 ft (Fig. 18). Owing to the political events, the well Biharnagybajom 1. could not be started.
