Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 1994. Sectio Geographiae.(Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 21)

Dávid Árpád: Contribution to the knowledge of the trace fossils found on the molluscs in the molluscan clay of Nyárjas hill /Novaj, Hungary

DÁVID ÁRPÁD CONTRIBUTION TO THE KNOWLEDGE OF THE TRACE FOSSILS FOUND ON THE MOLLUSCS IN THE MOLLUSCAN CLAY OF NYÁRJAS HILL /NOVAJ, HUNGARY ABSTRACT: The author examines the occurrence and distribution of trace fossils on the molluscs of the Molluscan Clay of Nyátjas Hill. There are four types of trace fossils have been found in the material collected at this locality. INTRODUCTION: Of the several Upper Oligocene outcrops in the environs of Eger /North-Hungary/, the most complete one is the Nyárjas Hill at Novaj. This locality lies about five km, north of Novaj /Fig.:l/. The Upper Oligocene layers of the outcrop are exposed in a 20 metres long and one meter deep ditch on the western slope of Nyárjas Hill /Fig.:2

/. The molluscan clay beds of this succession contain well-preserved mollusc fauna in an exceptional richness. The aim of my investigation has been to examine the number and distribution of trace fossils in the collected material. METHODS: Fifteen kilograms of molluscan clay was collected from the locality. After drying, the sample was treated by hot water and peroxide of hydrogen. This material was washed out through a 0,5mm sieve. Finally, the molluscan remains were assorted from among the other fossils /e.g. Foraminifera, Decapoda, Echinoidea, Osteichthyes/. 21