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Generalized Geologic Map of the Conterminous United States North
America Shaded Relief     The North American Tapestry of Time
and Terrain  The Two Maps Zoom In Legend and Rock Ages Rock
Types Political Boundaries   Manicouagan Crater    Close-up of
Manicouagan Crater from Tapestry image  Landsat image of
Manicouagan Crater Image source: USGS/EROS Landsat 7 Site   In
the northern part of Quebec, among some of the oldest rocks on
the continent, a curious ring of water surrounds a remarkably
circular island. This is the site of Manicouagan crater; with a
diameter of more than 70 km across its prominent rim (the outer
shore of the lake), it is one of the largest and best exposed
craters on the planet. Manicouagan was formed by a meteor’s
collision with Earth more than 200 million years ago. Many of
the local rocks were melted by the