Irhazer Shale

Irhazer Shale Irhazer II Formation
Stratigraphic range: Middle Jurassic [1] ~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′N7°54′E / 16.7°N 7.9°E / 16.7; 7.9
Approximate paleocoordinates	8°18′N2°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. ^[2] The dinosaur Spinophorosaurus is known from the formation. ^[3]

Description

As the overlying Tiouraren Formation of the Irhazer Group, the formation previously had been assigned an Early Cretaceous age. ^{[3] [4] [5]}

Fossil content

The 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

• Geology portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with ornithischian tracks
    • Ornithopod tracks
• Lists of fossiliferous stratigraphic units in Africa
  • List of fossiliferous stratigraphic units in Niger
• Geology of Niger

References

1. 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.
2. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
3. North of Aderbissinat at Fossilworks.org
4. Ifayen Ignère at Fossilworks.org
5. In Gall at Fossilworks.org
6. 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.
7. 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.
8. 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 .
9. 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 [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