This Memoir effectively summarizes the truly remarkable and visually spectacular volcanic province in northern Tanzania toward the southern end of the Gregory Rift or eastern branch of the East African rift system. In this volume the author provides an accessible summary of the geology, including information on the underlying structure, as the setting for a description of the volcanoes and their petrology and geochemistry. In this part of northern Tanzania there are a relatively large number and variety of volcanoes, generally quite young (Late Miocene to the present), ranging from basaltic shield volcanoes to stratovolcanoes, the latter composed mainly of...

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