Voûte à pénétrations (unequal groin vault)

A crossing of two voûtes en berceau (barrel vaults) or voûtes en berceau brisé (pointed barrel vaults) of unequal height.
Those types of vault can be found in the bas côtés (aisles) of the Notre-Dame-de-la-Nativité in Malay.
 The lower vault follows the axis of the aisle; the higher is perpendicular to this axis.
The picture shows this clearly.
See also voûte d'arêtes (groin vault).

Notre-Dame-de-la-Nativité - Malay