Nógrád Megyei Múzeumok Évkönyve XXX. (2006)

Természettudomány - Hír János: Előzetes beszámoló a Litkei kértabánya-völgyében végzett őslénytani ásatás eredményeiről

Abstract A preliminary report on the résulte of the paleontological excavations in the Krétabánya Valley at Litke A freshwater -continental séries was described South to litke in the Krétabánya Valley (= „Valley of the Chalk Mine") (Fig. 1.) inthebeginingofthe20thcentuiy.ThefinewHtealiatomite was intensively mined here during the thirties and the forties. The intercyclic lithostratigraphical position of the freshwater séries between the Karpatian and Badenian marine cycles was first realized by BARTKÓ (1949). The mollusc fauna was studied by CSEPREGHY-MEZNERICS (1950). She described the species Lymnaeus pachygaster nogmdensis n. sp., Planorbarius comu manteUi, Planorbarius conm var. But thèse taxa were not adéquate for exact biostratigraphic classification. In the Hungárián geological literature the geochronological position of the freshwater séries of litke was uncertain. It was described as Karpatian by a group of the authors (e.g. HÁMOR 1985) and it was regarded as Badenian by another group (e.g. BALOGH 1966). In 2001 a new period of the fíeld activity was initiated by the author and Dr. Péter PrakfaM. The paleovertebrate locality (GPS: N: 47° 49,727' E: 19° 40,668') was found by the author and Mr. Tibor Brunda in 2004.2 metric tones of sédiment was collected from the bone bearing diatomaceous clay (Fig. 2.) in 2005. A sieve with 0.5 mm mesh was applied for the flotation of the sédiment. Up to the présent we found the following taxa. Prológus oeningensis (König, 1825) Characteristic lower premolars of the species were found (Fig. 9.). Miodyromys sp. The extremely small dimensions of the molars are remarkable (Fig. 10.). Keramidomys sp. The material is few for an exact détermination (Fig. П.), but the species К. reductus and K. pertesimatoi can be excluded. Cricetodon sp. The dimensions are similar to С merni, but some morphological characters (e. g. the well developed posterior ectoloph of the labial cusp of the anteroconus is similar to С aureus (Figs. 3.-8.,Fig. 13.). Democncetodon mutilus FAHLBUSCH, 1964 One ml molar was found (Fig. 12.). In Hungary the species was found in Mátraszőlős 2. (HÍR & KÓKAY 2004). Megacricetodon sp. The morphology is similar to M. minor on the whole (Fig. 16.), but one Ml (Figs. 14 -15.) has a rare morphotype because the présence of long anteromesoloph and long mesoloph. As a preliminary conclusion we can classify the biochronological position of the fauna as early MN6 which is referable to the early Badenian. The field activity and the élaboration is going on. 215