Copper Hill Volcanics
Copper Hill Volcanics
Late Jurassic, Kimmeridgian
Chiefly schistose greenstone and phyllonite derived from mafic and intermediate flows with lesser felsic volcanic rocks. Includes metamorphosed tuff, volcanic breccia, and amygdaloidal basalt flows. Pillow lava is interbedded locally, as is minor chert and amphibolite. Metamorphosed to greenschist facies. At the base, it interfingers with the Salt Spring Slate (unit CWSS). Interpreted as marine island arc volcanic rocks based on interfingering with the Salt Spring Slate at the base and the presence of pillow lava and chert. Includes rocks previously mapped by Clark (1964) as Peaslee Creek Volcanics.