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Published online by Cambridge University Press: 01 May 2009
The valuable paper by Professor Harkness on “The Middle Pleistocene Deposits of Britain,” published in the pages of this periodical, was a completely successful attempt to synchronize the members of the Drift series of Ireland with those of England and Scotland. He shows that there exist in the East of Ireland detached portions of an Upper Boulder-clay resting on the shelly sands and gravels of the “ Middle Drift,” and that in other localities these sands and gravels may be observed resting on the Lower Boulder-clay, which is generally supported by rock with a glaciated surface. The order of succession of the members of the Drift series is, therefore, precisely similar to that of the North-western counties of England, where we have at the base (a) Lower Till or Boulder-clay; (b) Marine Sands and Gravels; (c) Upper Till or Boulder-clay; —an order of succession which I have for some years felt satisfied would be found ultimately to hold good over the whole of England.
page 294 note 1 Geol. Mag., Vol. VI., p. 542.Google Scholar
page 295 note 1 The Upper Boulder-clay, of which I first showed the importance in 1864 in the district around Manchester, has since been traced and identified by Mr. de Rance, Miss Eyton, Mr. Mackintosh, and Mr. Taylor, over the district extending from the Lakes to the valley of the Severn; and by Mr. A. H. Green and the author over Cheshire.
page 295 note 2 “On the Parallelism of the Drift Deposits in Lancashire and the Eastern Counties,” Geol. Mag., Vol. IV., p. 183.Google Scholar
page 296 note 1 Journ. Geol. Soc. Dublin, vol. i., p. 270.Google Scholar
page 296 note 2 Some of these cases of striœ were originally noted by the late Mr. Du Noyer. See Explanation of sheets 102 and 112 of the Geological Survey of Ireland. It is remarkable that the striæ along the coast near Dublin point in a direction, and hare been produced by ice coming from a region for the most part devoid of elevation.
page 296 note 3 Mem. Lit. and Phil. Soc. Manchester, vol. ii., third series, p. 453.Google Scholar
page 297 note 1 See Prof. Harkness's paper already quoted, p. 294.
page 298 note 1 See account of the Eskers at Stonepark by Mr. Symes, F.G.S., of the Geological Survey. Explanatory Memoir, Sheets 86, 87, and pp. 49–51, with woodcut.
page 298 note 2 Explanation Sheets 98, 29, and p. 27.
page 298 note 3 Explanation Sheets 102 and 112. Geol. Survey Maps, p. 67.
page 298 note 4 “Drift Deposits of Manchester,” supra cit. pp. 457–8.
page 298 note 5 Quart. Journ. Geol. Soc., vol. viii.Google Scholar
page 299 note 1 Possibly to the extent represented by Lyell in his work on “The Antiquity of Man,” p. 279.
page 299 note 2 To the extent shown by map, p. 276.—Ibid.
