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
Circum-Baikal Railway the Circum-Baikal route are attracted by the numerous nature reserves, including the rocky formations such as "Белая выемка". In the settlements along the Circum-Baikal, especially in Maritui, a number of early twentieth-century items in the modernist style are preserved. The following establishments are also located on the Circum-Baikal: The 100th anniversary of the railway was celebrated in the autumn of 2005. For this event the Baikal station was reconstructed, in which an exhibit was opened, devoted to the Circum-Baikal. The Sludyanka station was also rebuilt. Circum-Baikal Railway The Circum-Baikal Railway (, abbreviated "КБЖД") is a historical railway in the Irkutsk