EGU21-12976, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-12976
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Charophyte biostratigraphy of continental deposits in a filled-karst system: A case study from the Eocene bauxite cover-sequence at Gánt (Vértes Hills, Hungary)

Khaled Trabelsi1,5,6, Benjamin Sames1,7, Michael Wagreich1, Miklós Kázmér2, Andrea Mindszenty3, and Carles Martín-Closas Martín-Closas4
Khaled Trabelsi et al.
  • 1Department of Geology, University of Vienna, UZA 2, Althanstrasse 14, 1090 Vienna, Austria
  • 2Department of Palaeontology & MTA-ELTE Geological, Geophysical and Space Science Research Group, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary
  • 3Department of Physical and Applied Geology, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary
  • 4Departament de Dinàmica de la Terra i de l’Oceà, Institut de Recerca de la Biodiversitat (IRBio), Facultat de Ciències de la Terra, Universitat de Barcelona-UB, 08028 Barcelona, Catalonia, Spain.
  • 5Université de Sfax, Faculté des Sciences de Sfax, CP 3038, Sfax, Tunisie
  • 6Université de Tunis El Manar II, Faculté des Sciences de Tunis, LR18 ES07, C.P. 2092, Tunis, Tunisie
  • 7Sam Noble Museum, University of Oklahoma, 2401 Chautauqua Ave, Norman, OK 73072, USA

The Eocene ‘‘blue hole” freshwater limestones from the bauxite cover-sequence at the Gánt karst system (Vértes Hills), Transdanubian Central Range, north-western Hungary, have yielded rich charophyte assemblages of higher taxonomic and biostratigraphic interest. The taxonomic study of this flora allows revision and emendation of the species Raskyella peckii and facilitates the definition of a new evolutionary anagenetic lineage based on three successive anagenetic varieties of this species which were formerly considered as separate species or subspecies: Raskyella peckii var. peckii (early Lutetian–early Bartonian), Raskyella peckii var. caliciformis (early Bartonian), and Raskyella peckii var. vadaszii (late Bartonian). Based on these, we propose a new local charophyte biozonation with the new Raskyella peckii Superzone (Lutetian–Bartonian), subdivided into three successive charophyte partial range zones: The ‘Raskyella peckii peckii Zone’ (Lutetian–lowermost Bartonian) is locally characterized by an assemblage of R. peckii peckii, Gyrogona caelata forma caelata, G. caelata forma monolifera and Nitellopsis (Tectochara) palaeohungarica. The ‘Raskyella peckii caliciformis Zone’ (lower Bartonian) includes the local assemblage of R. peckii var. caliciformis, G. caelata forma caelata, G. caelata forma monolifera, G. caelata forma baccata, Nitellopsis (Tectochara) palaeohungarica and Chara media. The ‘Raskyella peckii vadaszii Zone’ (upper Bartonian) is composed of the local assemblage of R. peckii var. vadaszii, G. caelata forma bicincta, G. caelata forma baccata, G. caelata forma fasciata, G. tuberosa, Psilochara polita, Psilochara sp., Chara media and Chara subcylindrica. Future research may show the new local biozonation as applicable to whole Europe and complementing the current European charophyte biozonation. Our results show that the sequences from Gánt previously regarded as upper mid-Eocene (upper Lutetian–lower Bartonian) appear to comprise a longer chronostratigraphic interval, i.e. lower Lutetian till upper Bartonian, with also has implications on the understanding of the regional stratigraphy of the Transdanubian Central Range during the Eocene.

How to cite: Trabelsi, K., Sames, B., Wagreich, M., Kázmér, M., Mindszenty, A., and Martín-Closas, C. M.-C.: Charophyte biostratigraphy of continental deposits in a filled-karst system: A case study from the Eocene bauxite cover-sequence at Gánt (Vértes Hills, Hungary), EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12976, https://doi.org/10.5194/egusphere-egu21-12976, 2021.

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