Author:
Attila Vörös Research Group for Paleontology, Hungarian Academy of Sciences Hungarian Natural History Museum, Budapest, Hungary
H-1083, Budapest, Ludovika tér 2, Hungary

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Abstract

The formations of the Balaton Highland provide a high-resolution record of various fossil groups (ammonoids, bivalves, brachiopods) from the Early Triassic to the Carnian, with remarkable changes in taxonomic diversity. The local data differ considerably from the gradually increasing global diversity trends of the respective fossil groups. Ammonoids are rare in the Early Triassic; during the Anisian they reach a diversity maximum and remain rather diverse until the Carnian. This is connected to the considerable deepening of the sedimentary basin in the Middle Triassic. The benthic fossil groups show almost inverse local trends. In the Early Triassic, the proliferation of bivalves largely follows the transgressive pulses in the shallow marine setting; brachiopods are represented solely by Lingula specimens. Both the bivalve and the brachiopod diversity culminate in the middle Anisian what is interpreted in terms of extensional tectonic movements: the rocky escarpments of the disintegrated carbonate platforms provided favorable biotopes for sessile benthic organisms. The benthic diversities decreased significantly in the rest of Middle Triassic, which is due to the significant deepening of the local basin floor. The benthic groups reached maximum diversity in the Carnian. This is attributed partly to the filling up and shallowing of the local basin, partly to redeposition in the course of platform progradations, carrying rich fossil shell material from the neighboring shallow marine environments to the basin. Simultaneously, the sudden increase of the humidity (“Carnian pluvial event”) created extensive river systems in the European continent; the increasing supply of organic matter was favorable for the benthos in the marine environments.

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  • A. Vörös 1987 Preliminary results from the Aszófõ section (Middle Triassic, Balaton area, Hungary): a proposal for a new Anisian ammonoid subzonal scheme Fragmenta Mineralogica et Palaeontologica 13 53 64.

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  • A. Vörös 1993 Redefinition of the Reitzi Zone at its type region (Balaton area, Hungary) as the basal zone of the Ladinian Acta Geol. Hung. 36/ 1 15 38.

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  • A. Vörös T. Budai Gy. Lelkes M. Monostori J. Pálfy 1997 A Balaton-felvidéki középsõ-triász medencefejlõdés rekonstrukciója üledékföldtani és paleoökológiai vizsgálatok alapján Földtani Közlöny 127/ 1–2 145 177 (Middle Triassic basin evolution of the Balaton Highland (Hungary) based on sedimentological and paleoecological studies).

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  • A. Vörös T. Budai J. Haas S. Kovács H. Kozur J. Pálfy 2003 GSSP (Global Boundary Stratotype Section and Point) proposal for the base of Ladinian (Triassic). A proposal for the GSSP at the base of the Reitzi Zone (sensu stricto) at Bed 105 in the Felsöörs section, Balaton Higland, Hungary Albertiana 28 35 47.

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Editor(s)-in-Chief: Attila DEMÉNY

Deputy Editor(s)-in-Chief: Béla RAUCSIK

Co-ordinating Editor(s): Gábor SCHMIEDL

Editorial Board

  • Zsolt BENKÓ (Geochemistry, Ar dating; Institute for Nuclear Research, Debrecen)
  • Szabolcs HARANGI (Petrology, geochemistry, volcanology; Eötvös Loránd University, Budapest)
  • Anette GÖTZ (Sedimentology; Landesamt für Bergbau, Energie und Geologie, Hannover)
  • János HAAS (Regional Geology and Sedimentology; Eötvös Loránd University, Budapest)
  • István Gábor HATVANI (Geomathematics; Institute for Geological and Geochemical Research, Budapest)
  • Henry M. LIEBERMAN (Language Editor; Salt Lake City)
  • János KOVÁCS (Quaternary geology; University of Pécs)
  • Szilvia KÖVÉR (Sedimentology; Eötvös Loránd University, Budapest)
  • Tivadar M. TÓTH (Mineralogy; Petrology    University of Szeged)
  • Stephen J. MOJZSIS (Petrology, geochemistry and planetology; University of Colorado Boulder)
  • Norbert NÉMETH (Structural geology; University of Miskolc)
  • Attila ŐSI (Paleontology; Eötvös Loránd University, Budapest)
  • József PÁLFY (Fossils and Stratigraphic Records; Eötvös Loránd University, Budapest)
  • György POGÁCSÁS (Petroleum Geology; Eötvös Loránd University, Budapest)
  • Krisztina SEBE (Tectonics, sedimentology, geomorphology University of Pécs)
  • Ioan SEGHEDY (Petrology and geochemistry; Institute of Geodynamics, Bucharest)
  • Lóránd SILYE (Paleontology; Babeș-Bolyai University, Cluj-Napoca)
  • Ákos TÖRÖK (Applied and Environmental Earth Sciences; Budapest University of Technology and Economics, Budapest)
  • Norbert ZAJZON (Petrology and geochemistry; University of Miskolc)
  • Ferenc MOLNÁR (ore geology, geochemistry, geochronology, archaeometry; Geological Survey of Finland, Espoo)

Advisory Board

Due to the changes in editorial functions, the Advisory Board has been terminated. The participation of former Advisory Board members is highly appreciated and gratefully thanked.

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Central European Geology
Language English
Size Vol 1-63: B5
Vol 64- : A4
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2007 (1952)
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1
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2
Founder Magyar Tudományos Akadémia  
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