It is said that geology is as much history as science. Certainly, many areas of our subject depend on a reliable time scale for their proper execution, be it correlating geological histories from region to region or quantifying the rates of geological processes. Whilst refinements to specific parts of the time scale are regularly published piecemeal in the literature, it is sometimes worth while to stand back and survey the time scale as a whole, focusing as much on overall philosophy and methods as on detailed progress and problems. The first two editions of A Geologic Time Scale (Harland, W....

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