ring complexes and the chapter devoted to the Cameroon line. A detailed review of African ring complexes... XIV 2 Contents Phanerozoic Volcanism of Southwest Uganda: A Case for Regional K and lile Enrichment...Ultrapotassic Mafic-Ultramafic Magmatism in the Southwest Uganda Region of the African Rift: Implications from...Mafic-Ultramafic Ultra potassic Rocks of the Southwest Ugandan Area ........................... 3 Inferences.... . . ... 3 The Crust Under the Canary Islands Region ............. 4 Network of Fractures and Identity