Definition: Rolled pebbles

Pebbles polished and rounded by the action of the sea, torrents and glaciers. A type of soil based on very resistant rocks (granite, sandstone, quartz), for example in the southern Rhône valley, AOC Châteauneuf-du-Pape. Difficult to work, this type of soil stores heat during the day and releases it at night. The rounded pebbles ensure good drainage and limit evaporation.