Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 15. 1992. (Budapest, 1992)

FRAGMENTA MINERALOGICA ET PALAEONTOLOGICA 15. BUDAPEST, 1992 p. 41-94 The Early Sinemurian (Jurassic) brachiopod fauna of the Lókút Hill (Bakony Mts., Hungary) by A. DULAI Abstract: 33 Early Sinemurian (Bucklandi Zone) brachiopod species are described from the Lókút Hill (Bakony Mountains, Hungary). This is the richest Early Sinemurian brachiopod fauna of the Mediterranean region with 8 rhynchonellid, 10 spiriferid, 14 terebratulid and 1 strophomenid species representing 17 genera. INTRODUCTION The study of Liassic brachiopods of the Bakony Mountains dates back to the second half of the 19th century. Böckh (1874) described 16 Early Liassic brachiopods (of which 12 were new) from the southern Bakony Mountains. Kovács (1931) reviewed the rich brachiopod fauna from the Hierlatz-type Limestone of the Hamuházi Hill. Ormós (1937) described 47 Early Liassic taxa (of which 9 were new) from Kékhegy. Vígh (1943) described 61 brachiopod taxa (most of them were Early Liassic) from the neighbouring Gerecse Mountains. Noszky (1972) listed 80 Sinemurian (mainly Late Sinemurian) species without systematic description. Vörös (1982) identified 101 species in the Pliensbachian but their taxonomic treatment is pending. Clearly, there are significant differences in the knowledge of Liassic brachiopods of the Bakony Mountains. The rich Late Sinemurian and Pliensbachian faunas are well understood while relatively little is known about the Early Sinemurian brachiopods. A new, bed-by-bed collection yielded a rich Early Sinemurian (Bucklandi Zone) fauna (Dulai 1990). This is the richest brachiopod fauna of its age (proved by ammonites) in the Mediterranean region. The systematic description of this fauna is a long-needed work since Vígh (1943) produced the last major systematic work on Jurassic brachiopods from Text-fig. 1 - Index map showing the Hungary. Vörös (1983) described only a location of the Lókút Hill section few new Mediterranean genera and a new species.