Fragmenta Palaeontologica Hungarica

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Author(s): Vörös, A. & Pálfy, J.
Title: New data to the stratigraphy of the Pelsonian Substage at Köveskál (Middle Triassic, Balaton Highland, Hungary)
Year: 2002
Volume: 20
Pages: 53-60.

Abstract: New excavation and fossil collection at the classical Middle Triassic locality of Horog-hegy (Köveskál, Balaton Highland, Hungary) revealed that a nearly 40 m thick sequence of the Felsőörs Limestone Formation represents the Pelsonian and Illyrian Substages. Within the Balatonicus Zone, the Balatonicus Subzone, the Zoldianus Subzone and a third, unnamed subzone are proved by detailed collections; the Trinodosus and Pseudohungaricum Subzones of the Trinodosus Zone have been inferred from ammonoids found in loose blocks. Brachiopod limestone ("Recoaro" limestones, or Horoghegy Member) appears in two distinct horizons: in the Balatonicus Subzone and at the top of the Zoldianus Subzone. These two horizons were correlated with "Recoaro" beds at other, well-dated sections of the Balaton Highland (Aszófő, Felsőörs). The synchronous and repeated appearance of brachiopod shell beds in the basinal sequences is interpreted as reflecting local tectonic episodes related to the fragmentation of the Anisian platforms. The first phase may correspond to the first differentiation episode of the formerly uniform Megyehegy platform or ramp, i.e. the birth of the isolated platforms (e.g. Tagyon platform) in the Balatonicus SubChron. The second phase may be connected to the progressive fragmentation and demise of the platforms at the Balaton Highland at the end of the Zoldianus SubChron.
Keywords: Hungary, Balaton Highland, biostratigraphy, lithostratigraphy, ammonoids, brachiopods, Middle Triassic

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