Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 57. (Budapest 1965)

Csalogovits, I. J.: Geological and petrological conditions of the Szanda - Bercel area

respectively. The frequency of finer fractions, i.e. the gradual increase of sand content and the parallel continuous decrease of lyditic material indicates that the terrigenous material of the two formations originates in the same sedimentation cycle and that the covering gravel layer is of no basic-conglomerate character as could be excepted in case of assuming a Helvetian sediment formation. In its level, the gravel layer can be identified with the "base gravel" formations of the Salgótarján basin, while the Becsek lymnic coal deposit developed in it is similar to the "spread bed" known from the Salgótarján type. Fig. 3. Type-profile of the coal deposit of Becske. (After BENEDEK) Legends: 1. Clay with coal bends. 2. Clay. 3. Sandy Clay. 4. Coal Fig. 4.: The angle-inclinations' change of the andésite column through the volcanic bodies of the Mt. Bercel and Mt. Szanda. (NS. profile) Because of the Chattian-Miocene erosion discordance — taking into account the aforesaid analogies — the gravel layer can stratigraphically be classified as belonging to the Burdigalian stage. Above the Burdigalian gravel layer, a coarse gravel layer containing no fauna and showing different facies and gravel material, is deposited : it is described in the literature as belonging to the Pliocene. This formation is found only in small spots near Délkút farm north-east of Becske. The material of the giant gravels occasionally contains Triassic limestone gravel. F. HORUSITZKY describes Anisic and Eocene limestone gravel (containing Textularia sp) occurring in a similar formation in the environs of Acsa, and sees its origin in a northern denudation area. But the morphological conditions that developed after andesite-volcanism exclude the role of the northern denudation area in sedimentation.