This book is concerned essentially with the volcanoes of the Gregory Rift valley, the southern-most extension of the East Africa Rift system where rifting impinges onto the Tanzanian craton. The volcanism in this region has a distinctly different flavour to that occurring along the more northern parts of this rift, and is characterized by some extremely peralkaline rocks, and includes the unique natrocarbonatite lavas of Oldoinyo Lengai. The book provides some interesting historical notes regarding the geological investigation of the area and the initial recognition of the rift system by Suess. Although the bulk of the memoir consists of descriptions...

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