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 ?
Most of Northern Ontario is situated on the Canadian Shield, a vast rocky plateau.
The Boundary Waters Canoe Area Wilderness (BWCAW), located on what is called the Canadian Shield, has more than 2,000 interconnected lakes and rivers.
When I was small, I lived in lake-filled Sudbury, Ontario, my mind filled with the Canadian Shield burnt copper at sunset, outdoor ice rinks and graceful white birch trees.
2] and can be divided into 3 natural regions: the rolling uplands of the Canadian shield across the center of the province, the Hudson Bay lowlands to the north, and the Great Lakes and St.
Directory of the Turf he described his early career as follows: "Film actor, won Canadian shield for best actor 1938.
Canada offers the outdoor adventurer a myriad of experiences, from the rugged coastlines of the east, to the lakes and forests of the central Canadian Shield, from the spectacular mountains of the west to the pristine expanse of the arctic wilderness," explains Stevens, who outfits hundreds of Canada adventurers each year.
From the novels of James Fenimore Cooper to the film The Black Robe, the canoe has been an essential element in sparking the historic imagination about the original inhabitants and the European settlement of the Canadian Shield.
Between 1990 and 1994 the Geological Survey of Canada analyzed 11K lake sediment samples for Ta, Rb, Cs, and other rare metals, over favorable regions of the Canadian Shield in Alberta, Saskatchewan, Manitoba, and Ontario.
How well informed really is the mining community when it ignores the extension of the Canadian Shield into the US and the PGE potential of the Mid-Continent Rift?
Just think of the Grand Canyon, the Rockies or the Canadian Shield.

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