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Published online by Cambridge University Press: 01 May 2009
P.S.—Erratum.—There is an Erratum in my last communication which appeared in the Geological Magazine for April last at p. 149, 20 lines from foot of page, for “older than any metamorphic rocks of Scandinavia,” etc., it should read “older than any non-metamorphic or ‘clastic’ rocks, etc.—G.L.