Masset Formation

{{Short description|Geologic formation in British Columbia, Canada}}

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| name = Masset Formation

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| type = Geological formation

| age = Oligocene–Miocene

| prilithology = Calc-alkaline volcanic rocks

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| country = {{flag|Canada}}

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The Masset Formation is a volcanic formation on Graham Island of Haida Gwaii in British Columbia, Canada. It consists of calc-alkaline volcanic rocks related to subduction of the pre-existing Farallon Plate.{{cite book|last=Wood | first=Charles A. |author2=Kienle, Jürgen| title=Volcanoes of North America: United States and Canada | year=1990 | publisher=Cambridge University Press | location=Cambridge, England| isbn= 0-521-43811-X}} The Masset Formation is part of the Pemberton Volcanic Belt.