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
Ring of Fire III stand out". Ring of Fire III Ring of Fire III is an anthology created by editor-author-historian Eric Flint, first published in hardcover by Baen Books in July 2011. It is the third anthology in the 1632 series following after "Ring of Fire II" (2008). The book includes twenty short stories, together with a preface by the editor. The Preface by Eric Flint explains the contents of this anthology and mentions future works. The reviewer for SFRevu said that "this collection contains high quality and stories that are important to the development of the 1632 universe" and that "fans of the