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 one of the subsequent eruptive events. The Indonesian National Disaster Mitigation Agency stated at 10:00 on morning of 1 November that 38 people had been killed and 69,533 evacuated since Merapi began erupting on 26 October. The victims came from the district of Sleman, Yogyakarta, where 37 people (including 25 men and 12 women), and 1 baby died. Indonesia's vulcanology agency warned that flights around Yogyakarta may be disrupted. By the afternoon of 5 November the Indonesian National Disaster Management Agency was reporting 122 deaths attributable to the Merapi eruptions, primarily residents from Sleman, Daerah Istimewa, Yogyakarta. In the report