The In Beceten Formation, also Beceten or Ibecten is a Coniacian to Santonian geologic formation in the Iullemmeden Basin of Niger.

It has yielded a diverse fauna and some angiosperms.

[1] Among others, it has yielded polypterifoms,[2] urodeles,[3] anurans,[4][5] and turtles.

[6] Dinosaur remains are among the other fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

[7] The lithology primarily consists of clays, fine limestones and sandy clays.