Where are composites of sand and/or clay found in Champagne, along with chalk or marl?

• A. Vallée de la Marne, Val de Reims, Côteaux Sud d'Épernay, Val du Petit Morin, Côte de Sézanne
• B. Montagne de Reims only
• C. Côte des Blancs only
• D. All regions are chalk-only

Answer: (A)

In Champagne, soils aren’t all pure chalk or pure marl; some areas have river-driven alluvial deposits that bring sand or clay on top of, or mixed with, the calcareous bedrock. These composites of sand and/or clay with chalk or marl create soils that are more mixed in texture and drainage characteristics than a single, uniform chalk profile.

The regions listed are the ones where such alluvial, sand- or clay-containing horizons commonly occur alongside chalk or marl. They lie along the Marne valley and nearby landscapes where river sediments accumulate, producing the observed composite soils. By contrast, Montagne de Reims and Côte des Blancs are known for predominantly chalk soils with limited alluvial sand or clay, so they don’t fit the description of “composites of sand and/or clay found in Champagne, along with chalk or marl.”