Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 20. 2002. (Budapest, 2002)

56 VÖRÖS, A. is interpreted as an intra-basinal debris flow. The next, 10 cmthick brachiopod limestone layer ("Lower Recoaro') corresponds, by definition, to the "Horoghegy Member"of the FLF and is interpreted as accumulation of biodetritus Köveskál Horog-hegy (Horog Hill) Lardaraceras sp. Megaceratites ? sp. Paraceratites cf. trinodosus Judicarites // Schreyerites ? cf. binodosus Beyrichites ? cf. beneckei jpper brachiopod fauna Bulogites ? sp. Balatonites balatonicus lower brachiopod fauna mud pebbles 10 Legend c o N -Q I i n V) O QZold. Figure 2 — Stratigraphie section of the northern slope of Horoghegy (Köveskál), showing the bio- and chronostratigraphic subdivision based on the occurrences of age-diagnostic ammonoid taxa. — Zold. - Zoldianus, 1 = Megyehegy Dolomite, 2 - dolomitised limestones of the "transitional unit", 3 = limestones of the Felsőörs Formation (dashed symbols denote estimated parts of the sequence). & PÁLFY, J. redeposited from thick, wen-bedded, biturninous limestone unit represents the "Bocsár Member" of the FLF. In its upper onethird, it contains a finely bedded, laminated interval which is also characteristic to the correlative horizons of other basinal sections of FLF (e.g. at Aszófö). The unique feature of tiiis section is that the "Horoghegy Member" appears again, in a higher, separate level: this few dm thick, brownish brachiopod limestone bed ('TJpper Recoaro") is the source of the classic brachiopod fauna The next, odhre-yellow, fine-grained crinoidal limestone layer with many poorly preserved ammonoids has no known counterpart in other Anisian sections. It probably forms a transition to the overlying mudstone layers of the FLF which become more and more siliceous and cherry higher up and commonly contain silicified ammonoid remains ("Forráshegy Member"). Their thickness is estimated as attairiing 20 m. Biostratigraphy. The biostratigraphical subdivision of the section is based on the scattered occurrences of diagnostic ammonoids. The zonal/subzonal scheme developed by VÖRÖS (1987, 1998) was applied, with a mcxlified, informal use of an unnamed subzone which replaces the Binodosus Subzone (Figure 2, 3). The lowermost ammonoid-bearing bed is "Recoaro IT at locality Horoghegy IV, where Balatonites balatonicus and Norites gondola clearly prove the Balatonicus Subzone of Balatonicus Zone (Pelsonian). A little higher, a few layers of the weU-bedded, bitximinous Bocsár Member yielded the same fauna, therefore they also belong to the Balatonicus Subzone. After an unfossiliferous part, the bed irnmediately below "Recoaro F' yielded Bulogites ? sp., suggesting the Zoldianus Subzone of the Balatonicus Zone. The position of the boundary between these two subzones remains uncertain. No determinable ammonoids were recovered from the upper brachiopod bed ("Recoaro I"). The next higher layer yielded several specimens of Beyrichites cf. beneckei, Schreyerites ? cf. binodosus and a fragment of Judicarites cf. euryomphalus. This association may represent the formerly used "Binodosus Subzone" (sensu VÖRÖS 1987), but the content and position of this subzone became controversial recendy (see discussion). From the higher part of the section, ammonoids were collected only from loose blocks, but the presence of Paraceratites cf. trinodosus, Megaceratites ? cf. subnodosus and different species of Lardaroceras clearly shows the successive presence of the Trinodosus, (Camunum ?) and Pseuckohungaricum Subzones of the Trmodosus Zone (Dlyrian). Discussion 1. The unnamed (= formerly Binodosus)

] subzone Despite the lucid summary of the "centennial contradiaions" surrounding the Binodosus Zone or Subzone (ASSERETO 1971), the interpretation (content and position) of this unit now seems more confused than ever. For the Tethyan ammonoid zonal scheme, ASSERETO (1974) proposed to use the name Balatonicus Zone instead of Binodosus Zone for the interval covering the Pelsonian Substage, and this was accepted by the Subcornmission of Triassic Stratigraphy (ZAPFE 1983). At the subzonal level, the Binodosus Subzone was applied again by VÖRÖS (1987) but it was based on a single occurrence of the index species. Moreover, the attempt to define the Binodosus Subzone as the lowermost part of the Trinodosus Zone was not satisfactory and was not followed by others (e.g.