Issue |
BSGF - Earth Sci. Bull.
Volume 191, 2020
Special Issue Paleontology
|
|
---|---|---|
Article Number | 30 | |
Number of page(s) | 18 | |
DOI | https://doi.org/10.1051/bsgf/2020035 | |
Published online | 25 September 2020 |
Late Triassic ostracods from the Lycian Nappes, southwestern Turkey: implications on taxonomy and palaeobiogeographical distribution
Ostracodes du Trias supérieur des Nappes Lyciennes, Turquie du sud-ouest : implications taxinomiques et paléobiogéographiques
1
Muséum national d’Histoire naturelle, CR2P UMR7207, MNHN-CNRS-SU,
8, rue Buffon (CP38),
75005
Paris, France
2
Rue de la Combe 55,
1969
Eison, Switzerland
* Corresponding author: marie-beatrice.forel@mnhn.fr
Received:
15
December
2019
Accepted:
3
August
2020
The first ostracods known from the Lycian Nappes in southwestern Turkey are here reported, adding to the scientific understanding of marine ostracods during the Cordevolian, early Carnian, Late Triassic. The Karapınar Formation exposed at the Ağılıovası Yayla section yielded five species, including the typical Late Triassic Mirabairdia longispinosa Kristan-Tollmann, Nodobairdia mammilata Kollmann and Polycope pumicosa schleiferae Kozur. Their taxonomy is discussed and the ontogenetic development of Nodobairdia mammilata is described for the first time. In spite of the limited significance of this poor fauna for palaeoenvironment reconstitution, it points to a deposition in the offshore subtidal zone under moderate water depth, in line with previous interpretations. The palaeobiogeographical distribution of marine ostracods during the Late Triassic is updated and discussed. It implies that communication ways between the Palaeotethys and Neotethys oceans were already opened during the Cordevolian, slightly earlier than the Julian as previously proposed.
Résumé
Les premiers assemblages d’ostracodes connus des Nappes Lyciennes au sud-ouest de la Turquie sont ici rapportés, apportant à la compréhension scientifique des ostracodes marins du Cordévolien, Carnien inférieur, Trias supérieur. La Formation Karapınar affleurant à Ağılıovası Yayla a livré cinq espèces, dont Mirabairdia longispinosa Kristan-Tollmann, Nodobairdia mammilata Kollmann et Polycope pumicosa schleiferae Kozur, typiques du Trias supérieur. Leur taxinomie est discutée et le développement ontogénétique de Nodobairdia mammilata est décrit pour la première fois. En dépit des limites de cette faune pauvre pour la reconstitution du paléoenvironnement, elle indique un milieu de dépôt dans la zone subtidale sous une colonne d’eau modérée, en accord avec les interprétations antérieures. La distribution paléobiogéographique des ostracodes marins au Trias supérieur est mise à jour et discutée. Elle implique que les voies de communication entre les océans Paléotéthys and Néotéthys étaient ouvertes dès le Cordévolien, légèrement plutôt qu’au Julien comme proposé auparavant.
Key words: ostracods / Carnian / Lycian Nappes / Turkey / taxonomy / palaeobiogeography
Mots clés : ostracodes / Carnien / Nappes Lyciennes / Turquie / taxinomie / paléobiogéographie
© M.-B. Forel and P. Moix, Published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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