Circum-Superior Belt northwestern Superior craton margin intrude an older, 2,090 to 2,070 million-year-old dike swarm. The Ospwagan Group is younger than and the 1,864 million-year-old Winnipegosis komatiite belt lies to the southwest. Numerous tectonic settings have been suggested for triggering magmatism in the Fox River Belt, including a marginal basin rifting event. At the southern portion of the Circum-Superior Belt, a group of fragmental sediments composed of iron formation was formed during a period of magmatic activity in the Marquette Range Supergroup. Included in the Marquette Range Supergroup is the Hemlock Formation, a bimodal volcanic group that is estimated to have an
Ring of Fire: An Indonesian Odyssey television series Ring of Fire. Cut from 80 hours of 16mm film in co-production with WGBH-TV, Boston, RING OF FIRE was produced, directed and photographed by Lorne Blair and co-produced and written by Lawrence Blair. Executive producer was Frontline's David Fanning. Ring of Fire: An Indonesian Odyssey The Ring of Fire: An Indonesian Odyssey is a series of five documentary films following the decade-long Wanderjahr of the filmmaker/sibling partnership Lorne and Lawrence Blair. With financing from investors including the BBC and Ringo Starr, the Blair Brothers arrived in Indonesia from England in 1972. Then the Indonesian archipelago offered isolation for