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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.[1] The dinosaur Spinophorosaurus is known from the formation.[2]

Irhazer Shale
Irhazer II Formation
Stratigraphic range: Middle Jurassic
TypeGeological formation
Unit ofIrhazer Group
UnderliesTiouraren Formation
OverliesAssaouas Formation
PrimaryShale, claystone
OtherSiltstone, sandstone
Coordinates16°42′N 7°54′E / 16.7°N 7.9°E / 16.7; 7.9Coordinates: 16°42′N 7°54′E / 16.7°N 7.9°E / 16.7; 7.9
Approximate paleocoordinates8°18′N 2°36′E / 8.3°N 2.6°E / 8.3; 2.6
RegionAgadez Region
Country Niger
ExtentIullemmeden Basin
Type section
Named forIrhazer Izane
Irhazer Shale is located in Niger
Irhazer Shale
Irhazer Shale (Niger)


As the overlying Tiouarèn Formation of the Irhazer Group, the formation previously had been assigned an Early Cretaceous age.[2][3][4]

Fossil contentEdit

The following fossils were reported from the formation:[2][3][4]

See alsoEdit


  1. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. ^ a b c North of Aderbissinat at
  3. ^ a b Ifayen Ignère at
  4. ^ a b In Gall at


  • 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 readingEdit

  • 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