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Musée du Fjord

Saguenay graben
Transverse section: 200 million years

Graphic of the Saguenay graben

The breakdown of the "pangea" (about 200 million years) produced an opening called the Atlantic Ocean. During this period, our region underwent fragmentation by vast blocks that moved against each other according to the various fault planes. In the Saguenay region, there was a "north" fault and a "south" fault. Between these two faults, a rock basal complex collapsed and created a trench called the "Saguenay graben" that embeds the Saguenay-Lac-Saint-Jean region.

The Saguenay graben is a long flat-bottomed basin oriented in the east-west direction. It is 250 km long by 50 km wide and is bordered to the north by the Valin Mountains and to the south by the Laurentide wildlife reserve.

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LEGEND
  Anorthosite (black granit)
 

Limestone

 

Rocky basal complex

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