Geology
Mont Saint-Bruno might be the deep extension of a vastly eroded ancient volcanic complex, which was probably active about 125 million years ago. The mountain was created when the North American Plate moved westward over the New England hotspot, along with the other mountains of the Monteregian Hills. As a result, Mont Saint-Bruno forms part of the Great Meteor hotspot track. Its igneous rock consists mostly of pyroxenite and gabbro.
Read more about this topic: Mont Saint-Bruno