Whilst new data constraining the evolution of the Avalonian Superterrane in Southern Britain are most welcome, the conclusion that Compston et al. (2002) draw from this data, raise some points that merit comment.

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Firstly, the conclusion that the new age data for the Arfon Group enables a redefining of the Sarn Complex terrane affinity is questioned. In particular the statement

it also now seems unlikely that the Sarn Complex should be compared with the Padarn area as the Parwyd Gneiss has yielded a Rb–Sr date of 542 ± 17 Ma (Beckinsale et al. 1984). This is not now...

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