Moving to the right bank of the Gironde Estuary and moving down to where the vineyards lie along the Dordogne River, the emphasis shifts to Merlot-based wines in the area known as the Libournais. This shift occurs because the predominantly clay and limestone based soil is too cool to ripen Cabernet Sauvignon consistently. Blending grapes for Merlot are more likely to be Cabernet Franc (aka Bouchet) or Malbec (aka Pressac) although there are some Cabernet Sauvignon plantings in small areas where there is some gravel in the soil such as on the plateau to the north and northwest of Saint-Emilion. Starting with Fronsac AC commune which lies on the limestone based soils on the rolling hills above the Dordogne. This and Canon-Fronsac AC can be a good source for less expensive but good quality Merlot-based wine. Chateau Arnauton Fronsac 2009 ($15) Clear, deep ruby color. Clean, medium intense youthful aromas of ripe red fruit with a bit of earthiness. Dry, medium body and alcohol with m