Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 13. 1987. (Budapest, 1987)

section but they reach maximum frequency in the beds 68-74, in the otherwise almost barren interval. Deposit-feeders (Palaeonucula, Palaeoneilo) play an important role and are restricted to the lower third of the section. Suspension filterers are present all throught the sequence. This proves that suspended particulate matter was available all the time during the deposition of the sequence. In summary, the rich nektonic and benthonic communities in the lower third of the section "Aszófő I" point to favourable bottom environment and food-supply in those times. The upwards decreasing density and diversity suggest gradual deterioration of the environment. This tendency is disrupted by an interval (beds Nos 44-63) where nekton and benthos are practically missing and plankton is highly abundant. This interval can most probably be connected with a local and short anoxic episode. CONCLUSIONS The stratigraphical subdivision of the section "Aszófő I" is the following: Beds 89-91: Illyrian, Trinodosus Zone, Binodosus Subzone Beds 59-88: Pelsonian, Balatonicus Zone, Zoldianus Subzone Beds 44-58: Pelsonian, Balatonicus Zone, subzone ? Beds 1-43: Pelsonian, Balatonicus Zone, Balatonicus Subzone The rich fauna, the detailed collection and the detailed subdivision make the "Aszófő I" one of the most significant Pelsonian sections in the Balaton area and in the Alpine region. This justifies the further studies. Further collections including microfossils, and detailed description of the fauna are the most important tasks. The section may be proposed for stratotype of the Pelsonian Substage. REFERENCES ARTHABER, G. von (1896a): Die Cephalopodenfauna der Reiflinger Kalke. I. - Beitr. Paläont. Österr.-Ung. Orients, 10(1-2): 1-112. ARTHABER, G. von (1896b): Die Cephalopodenfauna der Reiflinger Kalke. II. - Beitr. Paläont. Österr.-Ung. Orients, 10(4): 192-242. ASSERETO, R. (1969): Sul significato stratigrafico della "Zona ad Avisianus" del Trias Medio delle Alpi. - Boll. Soc. Geol. Ital., 88: 123-145. ASSERETO, R. (1971): Die Binodosus Zone. Ein Jahrhundert wissenschaftlicher Gegensätze. Sber.öst. Akad. Wiss., Abt. I., 179 (1-4): 25-53. ASSERETO, R. (1974): Aegean and Bithynian: Proposal for two new Anisian Substages. In: ZAPFE, H. (Ed.): Die Stratigraphie der alpin-mediterranen Trias. - Schriftenreihe d. Erdwiss. Komm. Österr. Akad. Wiss., 2: 23-29. BALOGH, K. (1980): A magyarországi triász korrelációja. - (Correlation of the Hungarian Triassic.) - Ált. Földt. Szemle, ^5: 1-68. BÖCKH, J. (1873): Geologische Verhältnisse des südlichen Theiles des Bakony. I. - Jb. k. ung. geol. Anst., 2 (2): 27-180. CALLOMON, J.H. (1984): Biostratigraphy, chronostratigraphy and all that - again! - In: MICHELSEN, O. and ZEISS, A. (Eds.): International Symposium on Jurassic Stratigraphy (Erlangen, 1984), 3: 612-624. (Copenhagen) GAETÁNI, M. (1969): Osservazioni paleontologiche e stratigrafiche suli'Anisico delle Giudicarie (Trento). - Riv. Ital. Paleont., 75 (3): 469-546. JEFFERIES, R.P. S. and MIN TON, R. P. (1965): The mode of life of two Jurassic species of "Posidonia" (Bivalvia). - Palaeontology, 8 (1): 156-185. KOVÁCS, S. (1984): Beszámoló az IGCP 4. sz. projectjének ("A Tethys régió triásza") és az IUGS Triász Albizottságának munkaértekezletéről [Report on the workshop-meeting of the IGCP-4 Project and the Triassic Subcommission of IUGS] . - Földt. Közi., 114(1): 127-131. (In Hungarian) KOZUR, H. (1972): Vorläufige Mitteilung zur Parallelisierung der germanischen und tethyalen Trias sowie einige Bemerkungen zur Stufen- und Unterstufengliederung der Trias.Mitt. Ges. Geol. Bergbaustud. Innsbruck, 21(1): 361-412.