Irhazer Shale Explained

Irhazer Shale Irhazer II Formation
Type:	Geological formation
Age:	Bathonian,^[1] ~ Middle Jurassic
Period:	Bathonian
Prilithology:	Shale, claystone
Otherlithology:	Siltstone, sandstone
Namedfor:	Irhazer Izane
Region:	Agadez Region
Coordinates:	16.7°N 7.9°W
Paleocoordinates:	8.3°N 2.6°W
Unitof:	Irhazer Group
Underlies:	Tiouraren Formation
Overlies:	Assaouas Formation
Extent:	Iullemmeden Basin

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.

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]}

• Elaphrosaurus iguidiensis
• Ornithopoda indet.
• Spinosauridae or Megalosauridae indet.^{[6] [7]}
• Spinophorosaurus nigerensis

See also

• 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

Bibliography

• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. .

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

Notes and 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 . A new basal sauropod dinosaur from the Middle Jurassic of Niger and the early evolution of sauropoda . PLOS ONE . 2009 . 4 . 9. e6924 . 10.1371/journal.pone.0006924 . 2009PLoSO...4.6924R . Farke . Andrew Allen . 19756139 . 2737122. free .
2. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
3. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=104815 North of Aderbissinat
4. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=25202 Ifayen Ignère
5. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=25223 In Gall
6. 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. 10.4202/app.00101.2014. free. 10261/152148. free.
7. 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 . 10.26879/820 . 1935-3952. free . 10362/98436 . free .