peach blueberry cobbler

Name: peach blueberry cobbler
Cuisine: American
Ingredients: For the fruit; 1 1/2 (about 4 cups) pounds peaches, pitted and cut into slices*; 1 pint (about 2 cups) blueberries, rinsed and dried; 2/3 cup packed dark-brown sugar; 2 tablespoons flour; 2 tablespoons fresh lemon juice; 1/4 teaspoon ground cinnamon; 1/4 teaspoon salt; For the biscuit topping; 3/4 cup (3 1/4 ounces) all-purpose flour; 1/4 cup fine stone-ground cornmeal (yellow or white); 3 tablespoons dark brown sugar; 1 1/2 teaspoons baking powder; 3 tablespoons cold unsalted butter, cut into pieces; 1/2 cup buttermilk