Isotopic age determinations made prior to August 1963, including 31 new determinations, are reviewed. Data suggest igneous activity about 2700, 1600, and 1000 million years ago. Uranium mineralizations at 620 m.y. and 520 m.y. postdate the Lufilian orogeny and set a younger limit for the Katanga system. Whole-rock Rb-Sr determinations on Nchanga red granite give an age of 570 m.y., indicating sufficient rejuvenation to homogenize the isotopic composition of strontium throughout the mass. A mild thermal metamorphism dated at 490 m.y. affected Katanga rocks over wide areas.

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