| Irhazer Shale Irhazer II Formation | |
|---|---|
| Stratigraphic range: Middle Jurassic ~170 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ 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 / 16.7; 7.9 |
| Approximate paleocoordinates | 8°18′N 2°36′E / 8.3°N 2.6°E / 8.3; 2.6 |
| Region | Agadez Region |
| Country |  Niger |
| Extent | Iullemmeden Basin |
| Type section | |
| Named for | Irhazer Izane |
  Irhazer Shale (Niger) | |
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. The dinosaur Spinophorosaurus is known from the formation.
Description
As the overlying Tiouraren Formation of the Irhazer Group, the formation previously had been assigned an Early Cretaceous age.
Fossil content
The following fossils were reported from the formation:
- Allosauridae indet.
- Elaphrosaurus iguidiensis
- Ornithopoda indet.
- Paravipus didactyloides
- Spinosauridae or Megalosauridae indet.
- Spinophorosaurus nigerensis
See also
- List of dinosaur-bearing rock formations
- Lists of fossiliferous stratigraphic units in Africa
- Geology of Niger
References
- 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.
- ^ North of Aderbissinat at Fossilworks.org
- ^ Ifayen Ignère at Fossilworks.org
- ^ 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
- 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
- A. F. d. Lapparent. (1960). Les Dinosauriens du "Continental intercalaire" du Saharal central . 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