Since its introduction in 1978, Marlstone has been recognized as one of Sonoma Countys premier Bordeaux-style wines. The Marlstone vineyard blocks occupy the center of the Clos du Bois Alexander Valley estate. The vineyards of Cabernet, Merlot, Cabernet Franc, Malbec and Petit Verdot were first planted in 1969. Over the ensuing years, the grapes were vinifed and evaluated. It quickly became evident that the vineyards produced exceptional fruit with great varietal nuance and character.