Irhazer Shale

Irhazer Shale Irhazer II Formation
Stratigraphic range: Bathonian,^[1] ~167 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Middle Jurassic
Type	Geological formation
Unit of	Irhazer Group
Underlies	Tiouraren Formation
Overlies	Assaouas Formation
Lithology
Primary	Shale, claystone
Other	Siltstone, sandstone
Location
Coordinates	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]

The following fossils were reported from the formation:^[3]^[4]^[5]

^ 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
^ 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.

Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.