These weather factors combined with the soil types?continental and marine rocks, greywacke, limestone, shale and volcanic?create wines with great concentration and fresh acidity. The cooler end of the valley is perfect for?Chardonnay,?Pinot Noir, and is a good producer of?sparkling wines. The warmer, more inland part of the valley is home to some of California?s oldest?Zinfandel?vines.