Mont Saint-Grégoire (height: ) is a mountain in the Montérégie region of southern Quebec, Canada. It is composed of

essexite Essexite (), also called nepheline monzogabbro (), is a dark gray or black holocrystalline plutonic igneous rock. Its name is derived from the type locality in Essex County, Massachusetts, in the United States. Modern petrology identifies rock ...

and

syenite Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%). Some syenites contain larger proport ...

, strongly contrasting with the surrounding sedimentary rocks. The area around Mont Saint-Grégoire is known for its

maple syrup Maple syrup is a syrup made from the sap of maple trees. In cold climates, these trees store starch in their trunks and roots before winter; the starch is then converted to sugar that rises in the sap in late winter and early spring. Maple tree ...

production, as well as some wine production. The name was changed in 1923 from Mount Johnson .

Geology

It is thought that Mont Saint-Grégoire might be the deep extension of a vastly eroded ancient volcanic complex, which was probably active about 125 million years ago.A Hundred-Million Year History of the Corner Rise and New England Seamounts
Retrieved on 2007-08-01 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 The Monteregian Hills (french: Collines Montérégiennes) is a linear chain of isolated hills in Montreal and Montérégie, between the Laurentians and the Appalachians. Etymology The first definition of the Monteregian Hills came about in 190 ...

. It forms part of the vast

Great Meteor hotspot track The New England hotspot, also referred to as the Great Meteor hotspot and sometimes the Monteregian hotspot, is a volcanic hotspot in the North Atlantic Ocean. It created the Monteregian Hills intrusions in Montreal and Montérégie, the White ...

References

Mont Saint Gregoire Mountains of Quebec under 1000 metres Igneous petrology of Quebec Stocks (geology) {{quebec-geo-stub