1. Baker, B. H., Mohr, P. A., and Williams, L. A. J., Geol. Soc. Am. Spec. Pap., 136, (1972).
2. Laughton, A. S., Whitmarsh, R. B., and Jones, M. T., Phil. Trans. R. Soc., A 267, 227 (1970).
3. Geological Survey of Ethiopia, 1:250,000 Geological Map Sheet ND 37-11-11, Mekele (1971).
4. Azzaroli, A., Int. geol. Congr., 23rd Session, Prague, 1, 125 (1968).
5. Schachnai, E., Some manifestations of Rift Tectonics in Northern Harar Province, Ethiopia (Geological Survey of Ethiopia, 1972).