Micromorphs: Response of the Ammonite Fauna during the Toarcian Oceanic Anoxic Event (T-OAE) in the Es-Saffeh Mountains (Tiaret, Western Algeria) †
Abstract
:1. Introduction
2. Location and Geological Setting
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- The Faîdja Valley: It is occupied by marls from the Upper Jurassic period (Oxfordian). These deposits are sometimes covered by Miocene and Plio-Quaternary sediments.
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- The Taga Plateau: It occupies the southern flank of the anticlinal structure of Nador. It corresponds to the dolomitico-limestone formations of the Upper Jurassic period, which show a slight dip and a great extension towards the South.
3. Materials and Methods
4. Lithostratigraphic Framework
4.1. Lithological Unit I: (Sublithographic Marly Limestones)
- The first included Arieticeras gr. Amaltheus (Oppel), Emaciaticeras type E. Villae (Gemm), and Amaltheus margaritatus (Month). This association indicated an average Pliensbachian age;
- The second contained Canavaria (Canavaria) sp., Emaciaticeras sp., Canavaria (Canavaria) gr., and Zancliana (Fuc). This association indicated the Upper Pliensbachian (Emaciatum Zone).
4.2. Lithological Unit II (Marly Beds with Lumpy Levels)
- The first contained Dactylioceras sp., Dactyloceras delicatum (Bean-Simp), Dactyloceras tuberculatum (Guex), rare Hildaites gyralis (Buck), and Hildaites sp. This fauna indicated the lower Toarcian (Polymorphum Zone);
- The second interval yielded Hildaites cf., subserpentinus (Buck), Hildaiites cf. borialis (Seeback), and rare Harpoceratoiides sp. This association indicated the lower Toarcian (Levisoni Zone). In its top part, we noted the appearance of the first Hildoceras gr. lusitanicum (Merst.) indicating a middle Toarcian age (Bifron Zone).
5. Results
6. Discussion
7. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Bengoudira, F.D.; Touahria, A.; Sebane, A. Micromorphs: Response of the Ammonite Fauna during the Toarcian Oceanic Anoxic Event (T-OAE) in the Es-Saffeh Mountains (Tiaret, Western Algeria). Proceedings 2023, 87, 18. https://doi.org/10.3390/IECG2022-13808
Bengoudira FD, Touahria A, Sebane A. Micromorphs: Response of the Ammonite Fauna during the Toarcian Oceanic Anoxic Event (T-OAE) in the Es-Saffeh Mountains (Tiaret, Western Algeria). Proceedings. 2023; 87(1):18. https://doi.org/10.3390/IECG2022-13808
Chicago/Turabian StyleBengoudira, Fatiha Douas, Abdia Touahria, and Abbes Sebane. 2023. "Micromorphs: Response of the Ammonite Fauna during the Toarcian Oceanic Anoxic Event (T-OAE) in the Es-Saffeh Mountains (Tiaret, Western Algeria)" Proceedings 87, no. 1: 18. https://doi.org/10.3390/IECG2022-13808