Discovery of a new Lower Cretaceous Wealden-type ostracod fauna from the Bouhedma Formation, Central Tunisian Atlas, North Africa
- Autor(en)
- Manel Chnayna, Benjamin Sames, Khaled Trabelsi, Yassine Houla, Amine Hanini, Faycel Elferhi, Ahmed Skanji, Michael Wagreich, Mohamed Soussi
- Abstrakt
Micropalaeontological investigations of the Bouhedma Formation in the Jebel Majoura section from the
southern Central Tunisian Atlas revealed four successive ostracod associations (in total 16 species of 13
genera) of higher palaeoenvironmental, and thus far limited biostratigraphic and palaeobiogeographic
utility due to poor preservation. The most notable of these is a new upper Hauterivian?eBarremian nonmarine Wealden-type ostracod assemblage of high diversity from the Lower Member of the Bouhedma
Formation, the first one documented from the southern Central Tunisian Atlas, which consists of 9
species: Cypridea cyrtorostralis, Cypridea aff. tenuis, Cypridea aff. insulae, Cypridea sp., Theriosynoecum cf.
fittoni, Vecticypris polita, Alicenula? leguminella, as well as Klieana sp. and Fabanella sp. The subsequent
two ostracod assemblages from the Lower Member are characterized by the brackish species Rehacythereis? sp., Fabanella sp., Ilyocypris sp., and Schuleridea? sp. indicating transition to lagoonal environment. The subsequent ostracod assemblage from two levels of the Middle Member of the Bouhedma
Formation is exclusively composed of the euryhaline marginal marine Paracypris sp., and the marine
species Antepaijenborchella praealta, Protocythere cf. bedoulensis and Metacytheropteron aff. grosdidieri,
reflecting a marine incursion event.
The biostratigraphic utility, particularly that based on the non-marine fauna, is limited thus far but the
results are consistent with an upper Hauterivian?eBarremian age previously assigned to the Bouhedma
Formation from the southern Central Tunisian Atlas, facilitating its regional stratigraphic correlation with
coeval series from the northern part of this palaeogeographic domain.
The discovery of Tunisian Wealden-type non-marine ostracods from the southwestern margin of the
Tethys (North Africa) sheds new light on the dispersal patterns and palaeobiogeography of these ostracods, their potential utility as biostratigraphic tool, as well as on the significance of the north
Gondwanan continental basins and peri-Tethyan islands of the Central Tunisian Atlas for recording Early
Cretaceous non-marine microfaunas and -floras.- Organisation(en)
- Institut für Geologie
- Externe Organisation(en)
- Université de Tunis - El Manar, University of Oklahoma, Université de Sfax, Office National des Mines, Entreprise Tunisienne d'Activités Pétrolières
- Journal
- Cretaceous Research
- Band
- 127
- Anzahl der Seiten
- 23
- ISSN
- 0195-6671
- DOI
- https://doi.org/10.1016/j.cretres.2021.104942
- Publikationsdatum
- 11-2021
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105118 Paläontologie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Allgemeine Erdkunde und Planetologie
- Sustainable Development Goals
- SDG 14 – Leben unter Wasser
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/eff61522-5bb3-4783-b1fa-63ca33192e78