what is canadian shield, meaning
Canadian Shield. The Canadian Shield, also called the Laurentian Plateau, or Bouclier Canadien, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks that forms the ancient geological core of the North American continent, covered by a thin layer of soil.he Canadian Shield, also called the Laurentian Plateau, or Bouclier Canadien, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks that forms the ancient geological core of the North American continent, covered by a thin layer of soil.