Mosaic Assemblage

The Mosaic Assemblage is a rock unit of the Pacific Ranges of the Coast Mountains in southwestern British Columbia, Canada.

This geological formation formed 140,000 to less than 90,000 years ago when porphyritic plagioclase-augite-olivine basalt and trachybasalt was erupted in valleys and on mountain ridges.

Small patches of the Mosaic Assemblage overlie The Devastator Assemblage and form minor portions of the Mount Meager massif.

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Histogram showing the eruptive history of the Mount Meager massif. The eruptive period that created the Mosaic Assemblage is shown as B on the first row.