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
2010 eruptions of Mount Merapi suffering from serious depression and anxiety, while one man had committed suicide, reportedly due to stress. On Thursday, 18 November the Australian Government Department of Foreign Affairs issued a second update to their 11 November travel advisory bulletin acknowledging the announcement by Indonesian authorities on 15 November scaling back the 20 kilometre exclusion zone in some of the regions around Mount Merapi. The exclusion zone had been reduced to in the District (Kabupaten) of Magelang and to in the Districts of Klaten and Boyolali. The exclusion zone in the District of Sleman, towards the city of Yogyakarta, remained at .