processed normally about 500 million tonnes of will be released into the atmosphere. Hydraulic fracturing in Canada Massive hydraulic fracturing has been widely used in Alberta since the late 1970s. The method is currently used in development of the Cardium, Duvernay, Montney and Viking formations in Alberta, Bakken formation in Saskatchewan, Montney and Horn River formations in British Columbia. References Shale formations Oil-bearing shales in Canada Natural gas fields in Canada Devonian British Columbia Devonian Northwest Territories Frasnian Stage Givetian Stage Stratigraphy of British Columbia Devonian System of North America