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| tully @ 2005-08-29 18:10:16 | |
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"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) |
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