Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)
FRAGMENTA MINERALOGICA ET PALAEONTOLOGICA 14. BUDAPEST, 1989 P . 17-27 The Anisian/Ladinian boundary in the Vászoly section (Balaton Highland, Hungary) By A. VÖRÖS and J. PÁLFY (Received December 7, 1988) Abstract: The Anisian/Ladinian boundary was drawn by ammonoid biostratigraphy in a Middle Triassic key section at Vászoly (Balaton Highland, Hungary). Two ammonoid biozones, the Avisianum Zone and the Reitzi Zone were recognized. The authors' opinion is expressed in detail, supporting the use of the zones above, and arguing for their significance, as the Anisian/Ladinian boundary should be defined between them. Contribution was made to brachiopod biostratigraphy.. INTRODUCTION Stratigraphers have an old debt in Hungary: to provide new and modern data to the Anisian/Ladinian boundary problem in the classic Balaton Highland region. The Vászoly section seems to have key importance in this respect. The fossiliferous outcrops on the Öreg Hill near Vászoly were discovered by I. SZABÓ, and the first detailed collection made by the Hungarian Geological Survey (HGS) was led also by him. In 1982 I. SZABO produced an interim manuscript report for the HGS describing the section, providing the faunal list and ammonoid stratigraphy of the trench P-ll/a, but he suggested to draw the Anisian/Ladinian boundary much higher in the sequence. Recently the renewal of geological mapping in the Balaton Highland put the questions of Triassic stratigraphy in the lime-light. The large-scale mapping made by T. BUDAI (HGS) in the Vászoly area cast doubt on the suggested position of the Anisian/Ladinian boundary. The Vászoly section was sampled by S. KOVÁCS for conodont investigation and the material proved to be of great importance concerning the Anisian/Ladinian boundary question. His results combined with the earlier ammonoid data of I. SZABÓ are under publication (KOVÁCS et al. , in press) . In order to make a new collection of macrofauna the HGS reopened the trench P-ll/a. In the frame of the "Dezső Laczkó Fossil Hunting Camp" the Paleontological Department of the Hungarian Natural History Museum carried out the collection in 1988, with the eager assistance of Budapest University's students and professors. The present paper is devoted to show the biostratigraphic results derived from the study of fossils obtained in this way.
