A famennian (late devonian) conodont assemblage from brachiopod-rich limestons of the Djravank section (southern armenia)

A. Grigoryan (1) , V Serobyan , Carine Randon (2) , R Mayilyan , N Avagyan , T. Danelian (3)

1 IGS NAS RA - Institute of Geological Sciences of the National Academy of Sciences of Armenia
2 CR2P - Centre de Recherche en Paléontologie - Paris
3 Evo-Eco-Paléo (EEP) - Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198

Numerous conodont elements were yielded from a sandy brachiopod-rich limestone after processing with formic acid. The sample comes from a ca. 25 m-thick sequence of well-bedded nodular limestones, cropping out along a newly explored section (Djravank), situated on the south bank of the river Arpa, of the river Arpa, near the village of Arpi in Vayots Dzor region. SEM observations allow the identification of species Icriodus cornutus, I. iowaensis iowaensis and Polygnathus sp.cf. P.bischoffi suggesting an early Famennian age. The 60-40% relative abundance of Icriodus and Polygnathus elements represents an icriodontid-polygnathid conodont biofacies typical of shallow water environments.

Mots clés: Biostratigraphy; Palaeozoic; Upper Devonian; Armenia: Taxonomy; Conodont; Brachiopod; Limestone; Djrаvank

Domaines: Paléontologie

A. Grigoryan, V Serobyan, Carine Randon, R Mayilyan, N Avagyan, et al.. A famennian (late devonian) conodont assemblage from brachiopod-rich limestons of the Djravank section (southern armenia). Известия НАН РА Науки о Земле, 2019, 3, pp.3 - 12. ⟨mnhn-02900395⟩