When I left Imperial College to take up a postdoctoral fellowship at the University of Birmingham, the late Professor John Sutton pointed out that although Lapworth had introduced the term mylonite and the process of mylonitization (Lapworth 1885, 1886), he had given few petrographical details and no illustration of his specimens. John Sutton suggested that the material might still be in Lapworth's Birmingham collections, and that it would be interesting if these type specimens could be unearthed. Subsequently, Dr Isles Strachan, then at Birmingham, and with some familiarity with Lapworth's collections, kindly located a slide case containing thin sections, some...

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