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

Table V. BASIN subzones "coronates"% "sphaerocones"% Avisianum 7 93 Reitzi 12 88 Camunum +Pseudohungaricum Table VI. PELAGIC PLATEAU subzones 28 "coronates"% 72 "sphaerocones"% Avisianum 23 77 Reitzi 26 74 Camunum +Pseudohungaricum 46 CONCLUSIONS 54 The Middle Triassic (Late Anisian to Early Ladinian) ammonoid assemblages of the Balaton Highland are dominated by "sphaerocones" (Ptychitidae and Arcestidae); this clearly shows that the whole territory was under moderately deep, pelagic influence. The different topographic elements of the vertically dissected pelagic shelf (pelagic plateaus and basins) are characterized by ammonoid assemblages of different compositions. The proportion of the "coronates" (strongly ornamented ceratitids) is consistently lower in the basins than in the pelagic plateaus, whereas the "sphaerocones" show inverse relationship. The proportion of the other forms varies irregularly. During latest Anisian to Early Ladinian times, the proportion of "coronates" decreases, whereas the proportion of "sphaerocones" increases in time in the whole territory (both in the basins and on the pelagic plateaus). The proportion of "coronates", in spite of the decrease in time, is consistently higher on the pelagic plateaus than in the basins, as demonstrated in Fig. 6. This seemingly regular relationship may tentatively be used as a bathymétrie tool, i.e. for estimating the value and the rate of change of paleo-depth. In Fig. 6., a tentative (in fact, absolutely arbitrary) depth scale is shown where the 50% value (i. e. the equal proportion of "sphaerocones" and "coronates") is taken arbitrarily as pointing