Manicouagan Reservoir

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Manicouagan Reservoir

(mănĭkwäg`ən), annular artifical lake, 750 sq mi (1,942 sq km), SE Que., Canada, in a heavily forested area of the Canadian Shield. It has a maximum depth of 1,150 ft (300 m). Fed by four rivers, it was created by the Daniel Johnson Dam (1971), 25 mi (40 km) S of the reservoir on the Manicouagan River, and is located in one of the largest impact craters on earth. The crater was produced by a meteoritemeteorite,
meteor that survives the intense heat of atmospheric friction and reaches the earth's surface. Because of the destructive effects of this friction, only the very largest meteors become meteorites.
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 in the Triassic period, some 214 million years ago. René-Lavesseur Island, 780 sq mi (2,020 sk km), is ringed by the lake.
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References in periodicals archive ?
The age of the Manicouagan crater, he says, "falls in the middle of the Norian, but there is no evidence of anything going on in the middle Norian.
Because the Manicouagan crater is so much larger than Rochechouart, the molten rocks would have cooled much more slowly at the Canadian site, taking thousands or hundreds of thousands of years longer to lock in a record of Earth's magnetic field.
A comet that shattered into small pieces may have created live large impact craters on Earth, including one of the largest known (on land, the 100-km- (62-mi-) wide Manicouagan crater in Quebec, Canada.