1. Mohr, P. A., The Geology of Ethiopia (Univ. Coll. Addis Ababa Press, 1961).
2. Walsh, J., and Dodson, R., Rep. No. 82, Geol. Surv. Kenya (in the press).
3. Arambourg, C., Mus. Nat. Hist. Nat., Paris, 1, fasc. 3 (1943).
4. Patterson, B. (personal communication).
5. Saggerson, E. P., and Baker, B. H., Quart. J. Geol. Soc., 121, 481 (1965).