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In page Bas-Saint-Laurent:

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In the Quaternary, the region was marked by glaciation. the Wisconsin glaciation caused the crust to sink by 200 m (660 ft) in the vicinity of Rimouski. When the end of the glaciation started in 18,000 BP, it opened a sound in the Saint-Laurent valley, isolating the glacier covering Bas-Saint-Laurent from the one covering Côte-Nord. The isostatic rebound created an inland sea, the Sea of Goldthwait, which flooded the region under at most 200m of water in the area around Rimouski.[5]