Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 24-25. 2007. (Budapest, 2007)

Jurassic brachiopods of the Transdanubian Range (Hungary) Jurassic brachiopods of the Transdanubian Range SPECIES H SI S2 PI P2 Tl Securithyris fitos a Securithyris fitos a Hesperithyris renierii IIesperithyris cf. pacheia IIesperithyris cf. pacheia Lychn othyris rotzoana Lychn othyris rotzoana Zeilleria oenana Zeilleria oenana Zeilleriu uquilinu Zeilleriu uquilinu Aulacothyris ? cf. fuggeri Aulacothyris ? cf. fuggeri Bukonyithyris ovimontana Bukonyithyris ovimontana Apringia fraudatrix Apringia fraudatrix Apringia ? cf. suetii Apringia ? cf. suetii Apringia ? stoppanii Apringia ? stoppanii Apringia ? atlaeformis Pseudogibbirhynchia ? aff. verra Pseudogibbirhynchia ? aff. verra Prionorhynchia ? aff. ftabellum Prionorhynchia ? aff. ftabellum Cirpa ? Cf. subfurcillata Cirpa ? Cf. subfurcillata Homoeorhynchia acuta Homoeorhynchia acuta Pisirhynchiu ? aff. uhligi B Pisirhynchiu ? aff. uhligi ( ' Pisirhynchiu ? aff. uhligi ( ' Pisirhynchiu ? aff. uhligi D Pisirhynchiu ? aff. uhligi D Nan nirh) n ch ia sit utat a Nannirhynchia ? bulga Nannirhynchia ? bulga Nannirhynchia ? aff. bulga Nannirhynchia ? aff. bulga Koninckodonta aff. fuggeri Koninckodonta aff. fuggeri Koninckodonta ? aff. ulfurica Koninckodonta ? aff. ulfurica Liospiriferina cf. obovata Orthotoma aff. apenninica Rhapidothyris ? aff. beyrichi Rhapidothyris ? aff. beyrichi I talüthyris ? delorenzoi Linguithy

'rá cornico/ AM

« Linguithy

'rá cornico/ AM

« Antiptych'ma ? aff. gastaldii Antiptych'ma ? aff. gastaldii Aulacothyris ? baUinensis Aulacothyris ? baUinensis Bukonyithyris ? aff. ovimontana Bukonyithyris ? aff. ovimontana Abundant and diverse brachiopod faunas are known from several parts of the territory of the Transdanubian Range (TR); first of all from numerous sites in the Bakony Mountains, from the Vértes (Csóka-hegy near Mór), the Gerecse Mountains (e. g. the Kálvária-domb in Tata, and several localities in the western part of the Gerecse), and from the Pilis Mountains (Figure 1). The localities in the Bakony are of outstanding importance from several points of view: (1) Here rich faunas occur from most of the stages of the Jurassic, whereas in the other mountains only the Sinemurian, Bajocian and Tithonian stages yielded significant brachiopod assemblages. (2) At the Bakony localities the abundant faunas have been collected bed-by-bed, together with ammonoids, offering an excellent opportunity

7 to constrain their stratigraphic ranges, since the stratigraphie evaluation of the ammonoid faunas was carried out by GÉCZY (1971a, 1971b, 1972a, 1972b, 1974, 1976b), GALÁCZ (1976, 1980, 1995) and FŐZY (1987, 1988, 1993). (3) Partly for the above reasons, the systematic research of the brachiopods of the Bakony localities is in a more advanced state. <^ Figure 2 (continuation) — Stratigraphical distribution of the brachiopod species in the Early Jurassic of the Transdanubian Range. — H: Hettangian, SI: Early Sinemurian, S2: Late Sinemurian, PI: Early Pliensbachian, P2: Late Pliensbachian, Tl: Early Toarcian. Hettangian This stage is represented by the lithologically rather uniform, oncoidal-ooidal shallow marine Kardosrét Limestone in the Bakony Mountains. The list of its brachiopods was published by MICHALIK et al. (1991) and DULAI (1993). In the other areas, the Hettangian is usually missing due to a sedimentary

7 gap, except in the Kálvária-domb at Tata, where Upper Hettangian pelagic limestone with ammonoids was recorded (FÜLÖP 1976, GÉCZY 1976a). A recent, bedby-bed collection of limited extent complemented the ]akubirhynchia latifrons (GEYER, 1889) Cirpa aff. planifrons (ORMÓS, 1937) Calcirhynchia ? plicatissima (QUENSTEDT, 1852) Salgirella cf. alberta (OPPEL, 1861) Cuneirhynchia cartieri (OPPEL, 1861) Uospiriferina cf. alpina (OPPEL, 1861) Liospiriferina cf. pichleri (NEUMAYR, 1879) faunal list (DULAI 1998a). Scarce faunas from around Sümeg were also studied, and were tentatively attributed to the Hettangian (VÖRÖS in HAAS et al. 1984), but later their majority was proved as Sinemurian (DULAI 2002). From the Hettangian Stage in the TR 220 brachiopod specimens were collected. The list of brachiopod species recorded from the Hettangian of the TR (their stratigraphical distribution is shown in a range chart, in Figure 2): Lobothyris andleri (OPPEL, 1861) (Plate I: 2a-b) Lobothyris ovatissimaeformis (BÖCK1I, 1874) (Plate I: la—b) Lobothyris ? sospirolensis (UHEIG, 1879) Lobothyris ? subgregaria (DAL PlAZ, 1909) (Plate I: 3a-b) R/japidothyris ? complanata (BÖCKH, 1874) (Plate I: 4) Zeilleria mutabilis (OPPEL, 1861) Zeilleria perforata (PlETTE, 1856) Sinemurian After a sudden change in sedimentation, this stage is represented by deeper water pelagic sedimentary rocks all over the TR: pink and yellowish limestones (Pisznice Formation), crinoidal and cherty limestones (Isztimér Formation) and coarse biodetrital, mosdy sparitic limestones (Hierlatz Formation). The latter is exceptionally rich in brachiopods. Their faunas have been known for a long time (BÖCKH 1874, VIGH GY. 1913, ORMÓS 1937, VlGH G. 1943). From the Vértes Mountains (Csókakő, Csóka-heg}

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) a small fauna was described by FÜLÖP et al. (1960); we reexamined the specimens housed in the Museum of the Hungarian Geological Institute. Early Lias sic brachiopods have been known for centuries from the Kálvária-domb in Tata; the sporadic collections, made from time to time by several geologists, were summarized by G. VlGH (1976). This material was revised