Circum-Superior Belt age of . Another volcanic series in the Marquette Range Supergroup, known as the Gunflint Formation, has an age of . Further geologic units that are related to the Gunflint Formation include the Badwater volcanics and the Kiernan sills. A number of origins have suggested for the Marquette Range Supergroup magmatism. This includes subsidence being driven ahead related to thrusting of the Penokean orogeny or a possible back-arc basin, and lateral flow through the Pickle Crow dikes transported magma from the Fox River Belt area through the Superior craton for placement in the Marquette Range Supergroup. This suggested long-range origin
Ring of Fire (Northern Ontario) Bay. The Ring of Fire was named when the first significant mineral finds were made in the region, by Richard Nemis, after Johnny Cash's famous country and western ballad. Nemis, the founder and president of Noront Resources, was a lifelong fan of the singer. Prior to its discovery, Canada and the United States were compelled to rely on offshore sources for chromite, principally from South Africa. By the fall of 2011, the Ring of Fire was considered "one of the largest potential mineral reserves in Ontario" with "more than 35 junior and intermediate mining and exploration companies covering an area