Sinemuri (Alsó-jura) brachiopodák a Nyugati-Gerecséből

Translated title of the contribution: Sinemurian (Lower jurassic) brachiopods from the western gerecse (Hungary)

Edina Wettstein, Attila Vörös, Alfréd Dulai, J. Pálfy

Research output: Contribution to journalArticle

Abstract

Diverse Sinemurian brachiopod fauna was collected from the Hierlatz Limestone at the localities of Nagy-Teke Hill, Nyerges Hill and Alsó-Látó Hill by the Hungarian Natural History Musem and the participants of the summer field expedition of the Eötvös University (Budapest). The collected brachiopod material consists of 2470 specimens, 1321 of which were identified at species level. On the basis of their external morphology, 36 species of 21 genera were identified; in addition, two taxa were identified at genus level. In a few cases the identification was facilitated by studying the internal morphology (serial sectioning) of a specimen and applying statistical methods. Here, all taxa are illustrated by photographs. Diagnostic Mediterranean taxa were found at all the three localities. The Mediterranean character of the fauna supports the palaeogeographic picture that, in the Early Jurassic, the Mediterranean microcontinent — including the Gerecse area — was isolated from the Eurasian and African shelves by deep-sea belts; these deep-sea barriers hindered the dispersal of brachiopods. In the Jurassic the Gerecse, representing the north-eastern part of the Transdanubian Range, was an area with dissected submarine bottom topography. The western part of the Gerecse was an elevated submarine area (Gorba High), while the eastern Gerecse formed a deeper basin. The submarine elevation and its transitional zone towards the basin were the sites of intermittent accumulation of the biodetrital Hierlatz Limestone. The differences between the taxonomic composition of the three localities are revealed by quantitative palaeoecological analyses and can be explained partly by the local environmental differences, and partly by the episodic nature of the extensional tectonic movements.

Original languageHungarian
Pages (from-to)105-140
Number of pages36
JournalFoldtani Kozlony
Volume149
Issue number2
DOIs
Publication statusPublished - Jan 1 2019

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Sinemurian
brachiopod
Calcium Carbonate
Jurassic
deep sea
limestone
fauna
bottom topography
extensional tectonics
Tectonics
basin
Topography
photograph
Statistical methods
summer
history
Chemical analysis

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

Cite this

Sinemuri (Alsó-jura) brachiopodák a Nyugati-Gerecséből. / Wettstein, Edina; Vörös, Attila; Dulai, Alfréd; Pálfy, J.

In: Foldtani Kozlony, Vol. 149, No. 2, 01.01.2019, p. 105-140.

Research output: Contribution to journalArticle

Wettstein, Edina ; Vörös, Attila ; Dulai, Alfréd ; Pálfy, J. / Sinemuri (Alsó-jura) brachiopodák a Nyugati-Gerecséből. In: Foldtani Kozlony. 2019 ; Vol. 149, No. 2. pp. 105-140.
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