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Charlevoix crater
The Charlevoix crater is a large eroded meteorite impact crater in the Charlevoix region of Quebec, Canada. Only part of the crater is exposed at the surface, the rest being covered by the Saint Lawrence River. The original crater is estimated to have been in diameter and the age is estimated to be 342 ± 15 million years (Mississippian). The projectile was probably a stony asteroid, at least in diameter, and weighing an estimated . The Mont des Éboulements, situated in the exact centre of the crater, is interpreted as the central uplift, a consequence of elastic rebound.〔Interpretation Centre, Parc national des Grands-Jardins, Charlevoix〕 The crater is classified as a multi-ringed basin with a central uplift.
The impact origin of Charlevoix crater was first realized in 1965 after the discovery of many shatter cones in the area. Other evidence for impact includes planar deformation features (PDFs) in quartz and feldspar grains.
In contrast to the surrounding craggy Laurentian Mountains, the crater is relatively smooth and flat, which has facilitated human settlement. Today, 90% of the people of Charlevoix live within this crater.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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