The Manicouagan impact structure is one of the largest impact craters still preserved on the surface of the Earth. The annular moat, prominent in space images, fills a ring where impact-brecciated rock was once eroded away by glaciation. The diameter of the original crater was approximately three times the size of this circular lake. Erosion has removed about a kilometre of rock from the region. The inner plateau remaining in the center of the annular moat is made up of metamorphic and igneous rock types along with melt sheet and is not as susceptible to glacial erosion.
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Ed - the webpage has been updated).
Latitude = 51.37845 Longitude = -68.68525 
07-September-2006, 12:18 AM
The Manicouagan impact structure
Linear Mode
