Circum-Superior Belt event in Australia and 1,860 million year old magmatism of the Mashonaland event in Africa. The other questionable suggestion related to the Circum-Superior Belt is the existence of a suggested 1,900 million year old global superplume event. The long Labrador Trough, extending from Ungava Bay through Quebec and Labrador, includes two volcano-sedimentary series, the first ranging from 2,170 to 2,140 million years old and second ranging from 1,883 to 1,870 million years old. This magmatism is considered to have formed as a result of back-arc volcanism. The youngest magmatic series (1883-1870 Ma) contains 1,880 million-year-old carbonatites and lamprophyres. 1,883 to
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