The Squamish volcanic field is a small north–south trending

volcanic field A volcanic field is an area of Earth's crust that is prone to localized volcanic activity. The type and number of volcanoes required to be called a "field" is not well-defined. Volcanic fields usually consist of clusters of up to 100 volcanoes ...

on the

South Coast South Coast is a name often given to coastal areas to the south of a geographical region or major metropolitan area. Geographical Australia *South Coast (New South Wales), the coast of New South Wales, Australia, south of Sydney * South Coast (Q ...

British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

. It extends for only about from the eastern side of

Howe Sound Howe Sound (french: Baie (de /d')Howe, squ, Átl'ka7tsem, Nexwnéwu7ts, Txwnéwu7ts) is a roughly triangular sound, that joins a network of fjords situated immediately northwest of Vancouver, British Columbia. It was designated as a UNESCO Biosph ...

northeast of

Britannia Beach Britannia Beach (Sḵwx̱wú7mesh: Shisháyu7áy, ) is a small unincorporated community in the Squamish-Lillooet Regional District located approximately 55 kilometres north of Vancouver, British Columbia on the Sea-to-Sky Highway on Howe Sound. I ...

to the heavily forested slope on the western side of the

Squamish River The Squamish River is a short but very large river in the Canadian province of British Columbia. Its drainage basin is in size. The total length of the Squamish River is approximately . Course The Squamish River drains a complex of basins in the ...

mouth. It forms the southernmost end of the

Garibaldi Volcanic Belt The Garibaldi Volcanic Belt is a northwest–southeast trending volcanic chain in the Pacific Ranges of the Coast Mountains that extends from Watts Point in the south to the Ha-Iltzuk Icefield in the north. This chain of volcanoes is located in ...

, which comprises part of the

Canadian Cascade Arc The Canadian Cascade Arc, also called the Canadian Cascades, is the Canadian segment of the North American Cascade Volcanic Arc. Located entirely within the Canadian province of British Columbia, it extends from the Cascade Mountains in the south ...

. Its volcanoes are relatively minor to the more voluminous

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and per ...

es found throughout the Garibaldi Belt and are composed of

dacite Dacite () is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. ...

and lesser

basaltic andesite Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the world, including in Central Ameri ...

. The field gets its name from the nearby community of Squamish at the north end of Howe Sound on the

Sea to Sky Highway Highway 99 is a provincial highway in British Columbia that serves Greater Vancouver and the Squamish–Lillooet corridor over a length of . It is a major north–south artery within Vancouver and connects the city to several suburbs as well a ...

. Volcanism in the Squamish field has constructed at least two volcanic zones known as the

Watts Point volcanic centre The Watts Point volcanic centre is a small outcrop of Pleistocene age volcanic rock at Watts Point in British Columbia, Canada, about south of Squamish and north of Vancouver, and just north of Britannia Beach. It is the southernmost volcanic ...

and Monmouth Creek complex. The most recent eruptive activity at these volcanoes is likely

Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...

in age and are both likely products of

glaciovolcanism Glaciovolcanism is volcanism and related phenomena associated with glacial ice. The ice commonly constrains the erupted material and melts to create meltwater. Considerable melting of glacial ice can create massive lahars and glacial outburst floo ...

during the last glacial period.

References

Catalogue of Canadian volcanoes: Watts PointCatalogue of Canadian volcanoes: The Castle

External links

Volcanic fields of Canada Garibaldi Volcanic Belt Pleistocene volcanism Sea-to-Sky Corridor {{Canada-geology-stub

See also

References

External links