Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 41. (Budapest 1948)
Szurovy, G.: Geological structure of the Southern part of the Great Hungarian Plain
//// mite and limestone cemented by a calcareous and siliceous cementing material. The conglomerate consists of very manifold gravel grains, likewise in a calcareous and siliceous cementing material. The flora and fauna of the pierced strata is very poor (See table III). Very few typical forms have been found, so that a sharp distinction of Pleistocene, Levantiian and Upper Pannonian by means of the fauna is impossible. Upper- and Lower Pannonian as well as Tortonian can easily be separated. V. The Explored Structures. 1. Tótkomlós. In the structure of Tótkomlós the results of the gravity measurements do not agree with the results of the seismic exploration and of the deep wells. Therefore, the seismic measurements had first to be repeated very thoroughly, and thus a better conformity was obtained (Fig. 6—8). The structure represents a flat anticlinalfold with a NW— SE axis. It rises up from a depth of about 6,560 ft towards the southeast and culminates in a region already belonging to Rumania at about 3,250 ft, below the surface. The structure is broken by two faults with a SN — NE direction, one of which may be found in the neighbourhood of well Tk. 1. and Tk. 2., and the other near Tk. 5. The basement itself has only been encountered by the well Tk. 6. It consists of Triassic-dolomite. Above this basement there is a deposit of dolomite- and limestone breccia with enclosures of green strongly pyritic sand and big boulders, also consisting of limestone and dolomite. This layer contains poor accumulations of oil and rich deposits of gas, the oil supposedly having been strongly encroached by water through faults. These strata together with the Lower Pannonian marly clay beds wedge out towards the SE. So we cannot speak of a real anticlinal fold or an upwarping but rather of a faulted-buried hill structure. 2. Ferencszállás. The gravity picture of the structure Ferencszállás is very significant. It strikes with steep flanks from SE to NW. Seismic measurements proved the presence of a weak elevation at a depth of appro-
