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Keywords: Proterozoic Superior craton dike swarms.png Map of Proterozoic radiating dike swarms in the Superior craton own based on map found on http //www largeigneousprovinces org/09jan html http //www largeigneousprovinces org/09jan html 2010-05-17 Black Tusk Volcanism of Canada Proterozoic volcanism Maps of dikes volcanism Geological maps of North America Volcanological diagrams Volcanology of Canada Dike swarms |