to St Valérien, martyrized in Tournus in IIème century, with
half-buried because of the slope of the ground, it serves as sitted
with the bedside of the church. One will notice the characteristics of
voûtement, realized in a kind of concrete coarse and left gross
dismantling, heritage of the techniques of vault préromane.
central part of the crypt is almost entirely isolated from the
déambulatoire by a thick wall. Some curved arcades make it possible to
penetrate there. This space is divided into fifteen small arched spans
of edges by fine columns.