Ottawa-Bonnechere Graben
Rift valley extending from near Montréal through Ottawa in Canada / From Wikipedia, the free encyclopedia
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The Ottawa-Bonnechere Graben (also known as the Ottawa Graben) is a geological structure that coincides with a 55 km (34 mi) wide topographic depression extending from near Montréal through Ottawa. It is part of the Saint Lawrence rift system that also includes the seismically active Saguenay graben.[1] This rift valley was formed when the Earth's crust moved downward about a kilometre between two major fault zones known as the Mattawa and Petawawa faults.[2]
Quick Facts Location, Part of ...
Ottawa-Bonnechere Graben | |
---|---|
Location | Ontario and Quebec, Canada |
Part of | Saint Lawrence rift system |
Age | Late Proterozoic to Early Paleozoic |
Geology | Graben |
Dimensions | |
• Length | 700 km (435 mi) |
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