The Brèches du Grand Fond Group is a group of stratigraphic formations in France that were deposited between the Middle Jurassic and the Early Cretaceous.
The deposition was contemporaneous to the rifting of the Valais ocean, and overlies the pre-rift rocks along an angular unconformity.
The deposition of these two units was roughly contemporaneous to the deposition of the Brèches du Collet des Rousses and the Complexe Antéflysch Formation of the Internal Valais units.
[1] In general the Brèches du Grand Fond Group consists of coarse grained clastic sediments composed of pre-rift lithologies.
Outcrops can be studied [1][2] The Brèches du Grand Fond Group can be found within the following nappes:[1] Outcrops occur to the northwest of Bourg-Saint-Maurice.