Reference Base Environmental indications provided by the Hadar formation...
Gray, B.T.; Beden, M.; Guerin, C.; Taieb, M.; Tiercelin, J.J.; Page, N., 1980. Environmental indications provided by the Hadar formation (Afar, Ethiopia) fauna and correllation with geological evidence. Proceedings of the 8th Panafrican Congress of Prehistory and Quaternary Studies Nairobi, 5-10 Sep 1977: 115-117