Abstract
The relationship between radiometric and biostratigraphic ages is analyzed by local empirical methods and illustrated in chronograms for the mesozoic and paleozoic stages. The chronograms allow estimates for stage boundaries and their errors. Consequently, the ages for epoch boundaries and their errors are discussed which, for several reasons, may not be identical with the age and error of the oldest stage of an epoch. The analysis results in a comparative time scale which could be a compromise between the time scales currently under discussion. A specific feature of the derived time scale is its rather strong cyclicity with periods around 74 (73±1) ma.
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