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 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 neolithic cultures and their indigenous beliefs. The Blair Brothers spent over two decades documenting the relationships of island ecology and their peoples. One result of the Blair's work was a PBS-distributed multi-media package- an oversized picture book, alongside the Emmy-nominated BBC/PBS