A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2021; you can also visit the original URL.
The file type is
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 Geologicaldoi:10.5169/seals-163808 fatcat:b5folpfdwjg2ffb27az3ff6ksi