Canadian Shield


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Canadian Shield

or

Laurentian Plateau

(lôrĕn`chən), U-shaped region of ancient rock, the nucleus of North America, stretching N from the Great Lakes to the Arctic Ocean. Covering more than half of Canada, it also includes most of Greenland and extends into the United States as the Adirondack Mts. and the Superior Highlands. The first part of North America to be permanently elevated above sea level, it has remained almost wholly untouched by successive encroachments of the sea upon the continent. It is the earth's greatest area of exposed Archaean-age rock; the metamorphic rocks of which it is largely composed were probably formed in the Precambrian. Repeatedly uplifted and eroded, it is today an area of low relief (c.1,000–2,000 ft/305–610 m above sea level) with a few monadnocks and low mountain ranges (including the Torngat and Laurentian Mts.) probably eroded from the plateau during the Cenozoic era. During the Pleistocene epoch, continental ice sheets depressed the land surface (see Hudson BayHudson Bay,
inland sea of North America, c.475,000 sq mi (1,230,000 sq km), c.850 mi (1,370 km) long and c.650 mi (1,050 km) wide, E central Canada. Hudson Bay and James Bay (its southern extension) and all their islands border Nunavut Territory, Manitoba, Ontario, and Quebec.
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), scooped out thousands of lake basins, and carried away much of the region's soil. Drainage is generally very poor on the shield. The southern part of the shield has thick forests while the north is covered with tundra. The region is largely undeveloped but has great water-power potential and is a source of minerals, timber, and fur-bearing animals.

Canadian Shield

[kə′nād·ē·ən ′shēld]
(geology)

Canadian Shield

(in Canada) the wide area of Precambrian rock extending west from the Labrador coast to the basin of the Mackenzie and north from the Great Lakes to Hudson Bay and the Arctic: rich in minerals
References in periodicals archive ?
These two sealevel cycles are based on the Phanerozoic stratigraphy underlying the Prairies (Burgess 2008), which typically consists of a Cretaceous to mid-Cenozoic section resting unconformably on a Cambrian or Ordovician to Devonian section and this, in turn, rests with profound unconformity on the rocks of the Canadian Shield.
While most of the research for the appropriate geographical conditions for nuclear waste storage in Canada has been done in the Canadian Shield, international research has shown that other rock formations can also work for a nuclear waste storage site.
1998, Geology and mineral deposits of the Superior Province of the Canadian Shield, in Geology of the Precambrian Superior and Grenville Provinces and Precambrian Fossils in North America, Lucas, S.
Most of this large province is made up of large lakes and rocky outcroppings across the Canadian Shield.
Canadian Shield Consultants provides turnkey, on-site wastewater and water treatment systems for clients in mining, forestry, tourism and residential developments.
Then in 1954, three geologists out on a survey discovered these strange rock carvings on an outcrop of crystalline marble/limestone hidden deep in the boreal forest, right on the southern edge of the Canadian Shield.
Bird River, Manitoba - It's January 17th on the Canadian Shield three hours north of Winnipeg by road.
Indian trails were replaced by roads into the Canadian Shield and to Georgian Bay.
According to Chun, the new velocity is comparable to that found under cold continental areas such as the Canadian shield.
Alto Ventures is a Canadian gold exploration company with its main interest in properties in the Canadian Shield.
After hiring geologists and geophysicists to assist him, a systematic search of the Canadian Shield was made using aerial photographs and Royal Canadian Air Force maps.

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