Complementary data have been obtained on micas, basic effusives and glauconites which allow to date the Du, C2-C3, as well as certain Mesozoic divisions, in much the same way, as was done for the Soviet Geologic Time-Scale of 1964. Recently obtained data for the above geologic boundaries closely approximate those age-values which were previously published in 1964. The different geological time-scales presented in 1964 and 1968 at the XXII. and XXIII. Sessions of the International Geological

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... ress on behalf of Soviet geochronologists were reasonably well-based geological and geochronological statements.