The Irhazer Shale (French: Argiles de l'Irhazer) or Irhazer II Formation is a Middle Jurassic geologic formation of the Irhazer Group in the Agadez Region of Niger. Fossil ornithopod tracks have been reported from the formation.[2] The dinosaur Spinophorosaurus is known from the formation.[3]
| Irhazer Shale Irhazer II Formation | |
|---|---|
| Stratigraphic range: Middle Jurassic[1] ~ Middle Jurassic | |
 Paleoenvironment reconstruction | |
| Type | Geological formation |
| Unit of | Irhazer Group |
| Underlies | Tiouraren Formation |
| Overlies | Assaouas Formation |
| Lithology | |
| Primary | Shale, claystone |
| Other | Siltstone, sandstone |
| Location | |
| Coordinates | 16°42′N 7°54′E / 16.7°N 7.9°E |
| Approximate paleocoordinates | 8°18′N 2°36′E / 8.3°N 2.6°E |
| Region | Agadez Region |
| Country |  Niger |
| Extent | Iullemmeden Basin |
| Type section | |
| Named for | Irhazer Izane |
  Irhazer Shale (Niger) | |
Description
editAs the overlying Tiouraren Formation of the Irhazer Group, the formation previously had been assigned an Early Cretaceous age.[3][4][5]
Fossil content
editThe following fossils were reported from the formation:[3][4][5]
- Allosauridae indet.[6]
- Elaphrosaurus iguidiensis
- Ornithopoda indet.
- Paravipus didactyloides[7]
- Spinosauridae or Megalosauridae indet.[8][9]
- Spinophorosaurus nigerensis
See also
edit
References
edit- ^ Remes, K.; Ortega, F.; Fierro, I.; Ferrer, J.M.M.; Joger, U.; Kosma, R.; Ide, Oumarou Amadou; Maga, Abdoulaye; Ide, O. A.; Maga, A (2009). Farke, Andrew Allen (ed.). "A new basal sauropod dinosaur from the Middle Jurassic of Niger and the early evolution of sauropoda". PLOS ONE. 4 (9): e6924. Bibcode:2009PLoSO...4.6924R. doi:10.1371/journal.pone.0006924. PMC 2737122. PMID 19756139.
- ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ^ a b c North of Aderbissinat at Fossilworks.org
- ^ a b Ifayen Ignère at Fossilworks.org
- ^ a b In Gall at Fossilworks.org
- ^ Páramo, A.; Escaso, F.; Aberasturi, A.; Ortega, F. (2013). "A new theropod braincase from the Middle Jurassic of Azenak (Agadez, Niger)". VI International Symposium About Dinosaurs Palaeontology and Their Environment.
- ^ Mudroch, Alexander; Richter, Ute; Joger, Ulrich; Kosma, Ralf; Idé, Oumarou; Maga, Abdoulaye (2011-02-14). "Didactyl Tracks of Paravian Theropods (Maniraptora) from the ?Middle Jurassic of Africa". PLOS ONE. 6 (2): e14642. doi:10.1371/journal.pone.0014642. ISSN 1932-6203. PMC 3038851. PMID 21339816.
- ^ Serrano-Martínez, Alejandro; Vidal, Daniel; Sciscio, Lara; Ortega, Francisco; Knoll, Fabien (2015). "Isolated theropod teeth from the Middle Jurassic of Niger and the early dental evolution of Spinosauridae". Acta Palaeontologica Polonica. doi:10.4202/app.00101.2014. hdl:10261/152148.
- ^ Hendrickx, Christophe; Mateus, Octávio; Araújo, Ricardo; Choiniere, Jonah (2019). "The distribution of dental features in non-avian theropod dinosaurs: Taxonomic potential, degree of homoplasy, and major evolutionary trends". Palaeontologia Electronica. doi:10.26879/820. hdl:10362/98436. ISSN 1935-3952.
Bibliography
edit- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
Further reading
edit- A. F. d. Lapparent. (1960). Les Dinosauriens du "Continental intercalaire" du Saharal central [The dinosaurs of the "Continental Intercalaire" of the central Sahara]. Mémoires de la Société géologique de France, nouvelle série 39(88A):1-57
- K. Remes, F. Ortega, I. Fierro, U. Joger, R. Kosma, J. M. M. Ferrer, Project, Niger Project, O. A. Ide and A. Maga. (2009). A new basal sauropod dinosaur from the Middle Jurassic of Niger and the early evolution of Sauropoda. PLoS One 4(9):e6924:1-13