The Couches de Saint Christophe are a sedimentary formation deposited between the Late Cretaceous and the Paleogene.

It is a very monotonous sequence of calcitic sandstones and black schists.

The average thickness of the unit is 500 m.[1] The Couches de Saint Christophe are a post-rift sequence that overlies the Couches des Marmontains.

[2] The Couches de Saint Christophe occupy the following nappes:[2] Large outcrops of the Couches de Saint Christophe crop out north of Bourg-Saint-Maurice.

[2] The type locality of the formation is the Val de Bagnes in the canton Valais of Switzerland.