The Quarterly journal of the Geological Society of London . the Aare, supportinghis view by many detailed descriptions and illustrative as the latter may appear on paper, we must not forgetthat representations of a highly-disturbed district like the Alps inand to the north-east of the Chablais district must be to someextent hypothetical, because so much rock is either inaccessible orconcealed, and that the sections may permit more than one ex-planation. In fact, as Prof. Lugeon frankly admits, they havebeen differently interpreted by other Swiss geologists. It may seem pres
The Quarterly journal of the Geological Society of London . the Aare, supportinghis view by many detailed descriptions and illustrative as the latter may appear on paper, we must not forgetthat representations of a highly-disturbed district like the Alps inand to the north-east of the Chablais district must be to someextent hypothetical, because so much rock is either inaccessible orconcealed, and that the sections may permit more than one ex-planation. In fact, as Prof. Lugeon frankly admits, they havebeen differently interpreted by other Swiss geologists. It may seem presumptuous for one, whose knowledge of the dis-trict on which Prof. Lugeon chiefly relies is neither minute norrecent, to differ from his conclusions ; but my unbelief relates to 1 See especially Bull. Soc. geol. France, ser. 3, vol. xxiii (1895) p. 572, &vol. xxiv (1896) p. 535 ; ser. 4, vol. ii (1902) p. 411, & vol. hi (1903) p. 711. 2 Bull. Soc. geol. France, ser. 4, vol. i (1901) p. 810. 296 PROF. T. G. BONNET ON THE SOUTHERN ORIGIN [Aug. 1907,. II li II i! -<PQQP. principles rather than details, forI doubt whether, under any con-ditions which have existed inpost-Archaean times, large massesof rock could be compelled toadopt the behaviour which hishypothesis demands. Thus Ishall not attempt to discuss hispaper in detail (which, even if Ipossessed the requisite local know-ledge, would be a very lengthytask), but shall deal with itsgeneral and axiomatic must, however, demur to theinterpretation of two sections,among those cited in support ofhis hypothesis, which are takenfrom a region more familiar tome than the Chablais Alps. Theone, starting north of the Ofen-horn, runs through it across theLepontine Alps to the Yal d Anti-gorio (fig. 1): the other—gene-rally similar to it—practicallyfollows the line of the SimplonTunnel. Both exhibit a series ofrocks, strongly and progressivelyoverfolded towards the north,which consists of at least twovarieties of gneiss,
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