On the origin of the parallel roads of Lochaber : and their bearing on other phenomena of the glacial period / by Joseph Prestwich.

  • Joseph Prestwich
Date:
1879
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Licence: Public Domain Mark

Credit: On the origin of the parallel roads of Lochaber : and their bearing on other phenomena of the glacial period / by Joseph Prestwich. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    17/86 (page 663)
    /■ XVII. On the Origin of the ParcilUl Roads of Lochaher and their Rearing * on other Phenomena of the Glacial Period. By Joseph Peestwich, M.A., F.R.S., F.G.S., do., Professm- of Geology in the University of Oxford. Received March 27,—Read May 1, 1879. [Plate 46,] Contents. Page OTATE OF THE QUESTION § 1. The detrital and marine theories gg^ § 2. The glacial theory of Agassiz : Mr. Jamieson’s exposition 666 § 3. Objections to this exposition—1, the barriers; 2, the cols 668 § 4. The terraces of Maccdlloch ; the deltas of Chambers and Jamieson 671 § 5. The level of the snow-line gj-^ Views op the Author g^^ § 6. Depth of the ice-sheet in Lochaber: Extent of the glaciation 678 § 7. Exceptional condition of the ice-sheet in Lochaber 682 § 8. Distribution of the moraine detritus ggg § 9. The level of the land at the incoming of the glacial period 689 § 10. The effects of the subsequent submergence on the climate and on the ice-sheet 691 § 11. Structure of the “roads their inclination to the horizon 696 § 12. Origin of the “roads ” § 13. The “ minor barriers ” on the cols or passes at the head of the glens 710 § 14. The “ main barriers ” at the entrance of the glens 712 § 15. Irregularities in the levels of the “roads ” 7I9 § 16. Further considerations in connexion with the great ice-sheet suggested by the local phenomena of Lochaber 721 § 17, Conclusions ^24 Explanation of plate 725 State of the Question, It is now forty years since the origin of the parallel roads of Lochaber was discussed before the Eoyal Society by Darwin,'' in his well-known paper on the subject; but, although the problem had been for some time previously, and has since continued to be, the subject elsewhere of many communications, considerable difterence of opinion * Philosophical Transactions for 1839, p. 39, MDCCCLXXIX. I n