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1880s
- The term was subsequently conferred upon the larger Laurentian Plateau and the Laurentide Ice Sheet that covered it during the Pleistocene glaciation. The Canadian Shield only came into terminological being in the 1880s. Its name combines two ideas.
canadiangeographic.ca/articles/behind-the-canadian-shield/
The Canadian Shield (French: Bouclier canadien [buklje kanadjɛ̃]), also called the Laurentian Shield or the Laurentian Plateau, is a geologic shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks. It forms the North American Craton (or Laurentia), the ancient geologic core of the North American continent.
How Was the Canadian Shield Formed? The Canadian Shield formed over 3 billion years through processes such as plate tectonics, erosion and glaciation. Plate tectonics refers to the movement and collision of the Earth’s outer crust. When these crustal plates collide they may weld together, forming larger landmasses.
May 10, 2019 · The Canadian Shield only came into terminological being in the 1880s. Its name combines two ideas. The first was colonial politician Thomas D’Arcy McGee’s vision, articulated in 1860, of “one great nationality bound, like the shield of Achilles, by the blue rim of ocean” encompassing “the Western mountains and the crests of Eastern ...
The Canadian Shield constitutes the largest mass of exposed Precambrian rock on the face of Earth. The region, as a whole, is composed of ancient crystalline rocks whose complex structure attests to a long history of uplift and depression, mountain building (orogeny), and erosion.
- The Editors of Encyclopaedia Britannica
The Canadian Shield is part of an ancient continent called Arctica, which was formed about 2.5 billion years ago. It was split into Greenland, Laurasia, Scotland, Siberia, East Antarctica and is now roughly situated in the Arctic around the current North Pole.
The Canadian Shield is one of the oldest parts of the earth’s surface at over 4 billion years and covers roughly half of Canada’s land mass. Its name comes from its shape. On a map, it resembles a shield used in hand-to-hand combat.
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Nov 14, 2024 · The shield was rifted apart between Canada and Greenland by seafloor spreading in the Labrador Sea and in Baffin Bay between 90 and 40 million years ago. The rift subsequently moved to the east of Greenland, forming the Reykjanes Ridge that now separates the North American plate from the European plate.
