Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)

2. SANDY (1995a, Figure 12) showed the distribution of spiriferinids on a time-environment diagram. In the Early Jurassic represented by the Pliensbachian faunas an unambiguous increase of the ratio of spiriferinids can be seen from the shallow environments towards the outer shelf. However, this distribution pattern mainly based on the shallow water Pliensbachian faunas of Bulgaria (SANDY 1995a, Figure 8) where 55% of the brachiopods belong to the spiriferinids at the deepest environment, signed by number 6. However, this increase towards the deeper environments is not reflected by the Pliensbachian brachiopods of Hungary (SANDY 1995a, Figure 9); at the submarine horsts of the Bakony Mts (far from the seashore) the proportion of spiriferinids is less than 10% in each depthcontrolled associations. The spiriferinids behaved just opposite in the Gerecse Mts during the Early Sinemurian than SANDY (1995a) suggested: the proportion of spiriferinids increased from the middle of the Pisznice basin (6—8%) towards the Teke horst (17—19%). In the Gerecse Mts, the spiriferinids are more frequent at the submarine horsts than at the middle of the basins. This distribution pattern seems to be confirmed by the study of the brachiopod fauna from the famous Austrian Hierlatz Limestone localities of the Schafberg (VÖRÖS et al., in press). [The Hierlatz Limestone Formation is connected to Sinemurian-Pliensbachian submarine elevations and occurs in the form of neptunian dykes and submarine taluses (VÖRÖS 1991).] From the 813 identifiable brachiopod specimens, 250 belong to the spiriferinids (30.75%). This latter fact suggests a not only local (Gerecse) phenomenon. 3. There is a significant difference in the taxonomic composition of the basinal Lower Sinemurian sequences in the Bakony and Gerecse Mts. In the comparison of the deep water groups, given by SANDY (1995a), the sum of spiriferinids and long-looped terebratulids is 69% at Lókút, while maximum 34% at the Gerecse localities. Taking only long-looped terebratulids into consideration (as it was demonstrated above that the distribution of spiriferinids is controversial), its rate is 42% at Lókút and maximum 27% at the Gerecse localities. These data suggest that Early Jurassic basin probably were less deep in the Gerecse than in the Bakony Mts. Acknowledgements - I am grateful to A. VÖRÖS for his help and advice throughout this work. I thank B. GÉCZY and J. PÁLFY for identifying the ammonoids. I also thank J. PÁLFY for the revision of the English text. The paper benefited from critical reviews by A. VÖRÖS and J. PÁLFY. 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