They consist of calcitic schists with dolomite clasts interbedded with finegrained conglomerates.

[1] The Couches de l’Aroley are the lowest of the three post-rift sequences deposited in the Valais ocean.

It overlies syn-rift sequences of the Brèches du Grand Fond Group.

[2] The Aroley Formation can be found within the following nappes: The type locality is the Massif de la Pierre Avoi, in Saxon, Valais, Switzerland.

The formation is named after a "Plan Aroley" which lies below the Pierre Avoi.