Fragmenta Palaeontologica Hungarica

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Author(s): Vörös, A.
Title: Late Anisian Ammonoidea from Szár-hegy (Rudabánya Mts); a Dinaric-type fauna from North Hungary
Year: 2010
Volume: 28
Pages: 1-20.

Abstract: More than three hundred ammonoid specimens have been collected from a few layers of red limestones of Hallstatt (Schreyeralm) or Han Bulog type, exposed on the top of the Szár-hegy (Rudabánya Mts, North Hungary). The fauna is dominated by Ptychitidae (over 90%), but a few ceratitid species of biostratigraphical importance (Lardaroceras pseudohungaricum, L. krystyni, Asseretoceras camunum, Megaceratites subnodosus, Kellnerites bispinosus) have also been identified. These prove the Camunum + Pseudohungaricum subzones of the Upper Anisian Trinodosus Zone. The very high proportion of the smooth, sphaeroconic ammonoid morphotypes indicates pelagic and bathyal (at least 500 m deep) environment. Most of the 17 ammonoid species of the Szár-hegy fauna occur in the Dinarides (15 species), while in the faunas of the geographically closer Southern Alps and Balaton Higland the number of co-occurring species is 8 and 9, respectively. Another important indicator is the occurrence of the genera Sturia, Gymnites and Procladiscites in the Szár-hegy fauna, what clearly shows the principal palaeobiogeographic affinity of the Szár-hegy fauna towards the Dinaric region.
Keywords: Middle Triassic, taxonomy, Hungary, Ammonoidea, stratigraphy, palaeobiogeography
Subject: palaeontology

Journal: Fragmenta Palaeontologica Hungarica
Journal abbreviation: Fragm. Palaeont. Hung.
ISSN: 1586-930X
Publisher: Hungarian Natural History Museum, Budapest
Editor(s): Szabó, J. & Dulai, A.