1. Harland W. B. Member of the Precambrian–Cambrian Boundary Working Group, I.U.G.S.
2. Bassett M. G. Secretary-General, International Commission on Stratigraphy, I.U.G.S.
3. Cowie J. W. Chairman, Precambrian–Cambrian Boundary Working Group, I.U.G.S.; Project Leader I.G.C.P. Project 29 (Precambrian–Cambrian Boundary).
4. Semikhatov M. A. Council member of the U.S.S.R. Geochronological Commission; Vice-Chairman of I.G.C.P. Project 179 (Stratigraphic methods as applied to the Proterozoic).
5. Sokolov B. S. Chairman of the Stratigraphic Committee of the U.S.S.R.