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

FRAGMENTA MINERALOGICA ET PALAEONTOLOGICA 18. BUDAPEST, 1996 p. 31-61 Pliensbachian ostracod fauna from condensed limestones of the Bakony Mts. (Transdanubian Central Range, Hungary) by M. Monostori MONOSTORI, M. (1996): Pliensbachian ostracod fauna from condensed limestones of the Bakony Mts. (Transdanubian Central Range, Hungary). - Fragm. Min. et Pal., 18: 31-61. Abstract: This work contains the description and paleoecological evaluation of ostracoda fauna from some condensed limestone sections of the Bakony Mts., Transdanubian Central Range, Hungary. From 17 species determined in this fauna 10 are new species or subspecies. Further 7 species are well known from the epicontinental European seas. The material of 10 more species is not suitable for their description and correct determination. The distribution of specimens shows, that the most frequent species have Inner Tethyan origin and they are descendants of local Triassic forms. During the submersion of the Late Triassic carbonate platforms in the Early Jurassic some of their characteristic faunal elements could survive on the seamounts (e. g. some ornate Bairdiidae). The sediments were accumulated on or around the seamounts mainly below the sublittoral zone and the seamount forms were mixed with the basin forms. INTRODUCTION In the literature of the Jurassic ostracods we have a lot of works about the fauna of epicontinental seas, on the other hand, there are only a few works about the true "Tethys-forms", (FARINACCI et al. 1979, LORD 1988, LORD & BOOMER 1990, LORD & LAMBOURNE 1991). The new method of preparation by concentrated acetic acid made possible extracting carbonate microfossils from hard limestones and marls (LETHIERS & CRASQUIN-SOLEAU 1988). In the Transdanubian Central Range the most important Jurassic formations are limestones and marls, sometimes in reduced and condensed sections. Because of the condensation the specimen number of the macro- and microfauna is higher than in a normal deep-water sediment. We have chosen some Pliensbachian beds from these condensed sequences to investigate their microfauna. The first result of this work is the paper about Pliensbachian foraminifers from Szentgál (GÖRÖG 1995). LOCALITIES The samples were collected from the following sections of the Bakony Mts: