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] 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]