The Role of the Canadian Shield in Wine Flavor An Ancient Foundation Beneath Every Vine Stretching across nearly half the country, the Canadian Shield  is one of the oldest geological formations on Earth, over 2.5 billion years old. Its rugged landscape of granite, gneiss, and metamorphic rock forms the very foundation of much of Eastern and Northern Canada, including key wine regions like Ontario’s Prince Edward County  and parts of Niagara’s Escarpment . But the Canadian Sh