Having first encountered the Geological Society Special Publication series when volumes in the low teens were being published, the realization that it has reached number 220 had me reflecting on the human time scale; slightly ironic since this is a collection of papers about geological time. Over twenty years or so, this series must have been producing at about one issue per month and will occupy over five metres of shelf space in any library fortunate enough to have collected the full set. The latest edition describes some of the recent developments in constraining process rates of metamorphism and deformation....

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