On the slopes : layers of scree, at varying depths, lie on the bedrocks; in that all drain well, they are able to retain large reserves of water. This means that, thanks to the roots' ability to penetrate up to six metres into the soil, the vines can benefit from water throughout the hot season without suffering from drought.
Low down in the valley, there are small alluvial terraces all long the dry Terrieu river bed. The soil on these terraces is made up of scree swept flat by the river, and mixed with white clay and soft limestone (a geological substrata caused when the river bed started forming).

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