Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 18. 1996. (Budapest, 1996)

Fig. 6. Late Anisian - Early Ladinian subsidence curves for the pelagic plateaus and basins of the Balaton Highland as deduced from paleobathymetric estimation based on the proportion of "sphaerocones'V'coronates" Accepting and using this arbitrary "tangential" scale, the depth of the pelagic plateaus and the basins is given as around 100 m and 200 m, respectively for the time of the Camunum horizon. The constructed curves show that both the plateaus and the basins subsided gradually during the time interval in question. The depth difference between them slightly increased: the plateaus subsided to about 220 m, while the basins almost reached the 400 m depth for the time of the Avisianum horizon. This conclusion seems to be in accordance with the general trends of subsidence expected on passive and/or transtensional continental margins and fits well into the paleogeographical picture outlined for the mid-Triassic shelf region including the Southern Alps and the Transdanubian Central Range (cf. BUDAI & VÖRÖS 1992, 1993, BERTOTTI et al. 1993, HAAS & BUDAI 1995). REFERENCES BERTOTTI, G., PICOTTI, V., BERNOULLI, D. & CASTELLARIN, A. (1993): From rifting to drifting: tectonic evolution of the South Alpine upper crust from the Triassic to the Early Cretaceous. - Sedimentary Geology, 86: 53-76. BUDAI, T. & VÖRÖS, A. (1992): Middle Triassic history of the Balaton Highland: extensional tectonics and basin evolution. - Acta Geol. Hung., 35: 237-250. BUDAI, T. & VÖRÖS, A. (1993): The Middle Triassic events of the Transdanubian Central Range in the frame of the Alpine evolution. - Acta Geol. Hung., 36: 3-13. BRACK, P. & RIEBER, H. (1993): Towards a better definition of the Anisian/Ladinian boundary: New biostratigraphic data and correlations of boundary sections from the Southern Alps. - Eel. Geol. Helv., 86(2): 415-527.