Lake Manicouagan Reservoir

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By romulusnr @ 2005-04-21 01:05:24
Manicouagan Reservoir is an annular lake in northern Quebec, Canada, the remnant of an impact crater made approximately 212 million years ago, by a 5 km diameter asteroid. It is today 72 km in diameter.

The lake was created by a series of hydroelectric dams in the 1960s. The lake acts as a giant hydraulic battery for Quebec, and generates enough power that some is left over in the summer for sale to New England in the U.S.
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@ 2005-08-29 18:10:16
"The moderately eroded, central part of the structure (the plateau surrounded by the lake) is partly covered by impact melts and contains shattered rocks and several uplifted peaks about 5 kilometers north of the center. The quantity of data obtained on the melt sheet and the underlying target rocks make Manicouagan one of the most intensely studied large complex impact structure in the world, and it is an important source of ground-truth data for understanding the cratering process. The radiometrically determined age of the structure is close to (but not quite identical with) the biostratigraphically derived age of the Triassic-Jurassic boundary."
(http://www.lpi.usra.edu/publications/slidesets/craters/slide_28.html)