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Canadian Shield
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The Canadian Shield or Bouclier canadien (French), also called the Laurentian Plateau, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geologic shield) that forms the ancient geologic core of the North American continent (the North American Craton or Laurentia). Glaciation has left the area only a thin layer of soil, through which the composition of igneous rock resulting from long volcanic history is frequently visible.[3] With a deep, common, joined bedrock region in eastern and central Canada, the Shield stretches north from the Great Lakes to the Arctic Ocean, covering over half of Canada and most of Greenland; it also extends south into the northern reaches of the United States. Human population is sparse and industrial development is minimal,[4] but mining is prevalent.
Canadian Shield
Stratigraphic range: Precambrian
Pha.
Proterozoic
Archean
Had'n
TypeShieldUnit ofNorth American cratonSub-unitsLaurentian Upland
Kazan[1]Area8 000 000 km2[2]LocationRegionNorth AmericaCountry Canada
 United States
 Greenland
The Canadian Shield is a broad region of Precambrian rock (pictured in shades of red) that encircles Hudson Bay. It spans eastern, northeastern, and east-central Canada and the upper midwestern United States.