Mont Shefford is a Monteregian Hill located in Shefford in the

Estrie Estrie () is an List of Quebec regions, administrative region of Quebec that comprises the Eastern Townships. ''Estrie'', a French neologism, was coined as a derivative of ''est'', "east". Originally settled by anglophones, today it is about 90 pe ...

region of

Quebec Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

. Mont Shefford is tall, and was home to the Ski Shefford

ski resort A ski resort is a resort developed for skiing, snowboarding, and other winter sports. In Europe, most ski resorts are towns or villages in or adjacent to a ski area–a mountainous area with pistes (ski trails) and a ski lift system. In North Am ...

which closed in 2006.

Geology

Mount Shefford was formed some 125

million years Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to (i.e. years), or approximately 31.6 teraseconds. Usage Myr is in common use in fields such as Earth science and cosmology. Myr is also used ...

ago during an underground intrusion of

magma Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma (sometimes colloquially but incorrectly referred to as ''lava'') is found beneath the surface of the Earth, and evidence of magmatism has also ...

. This magma did not reach the Earth's surface and remained in a deep freeze. The mountain appeared following the erosion of nearby

sedimentary rock Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or de ...

s by

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

s. The sedimentary rock was more fragile than the

metamorphic rock Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock ( protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, caus ...

formed by the contact of the magma and the surrounding sedimentary rock. CINLB - 20120916 - Mont Shefford

References

Mountains of Quebec under 1000 metres Mont Shefford Igneous petrology of Quebec Stocks (geology) La Haute-Yamaska Regional County Municipality {{montérégie-geo-stub