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The Distribution of Scandinavian Boulders in Britain
Published online by Cambridge University Press: 01 May 2009
Extract
In the following pages the writer has attempted to collate the records of boulders of Scandinavian origin which are scattered through many publications. The lists of boulders in Table C of this paper are an amplified version of similar lists drawn up by T. Sheppard in 1895, and, in addition, lists of percentages of various types of boulders are shown in Tables A and B, those in A having been already recorded, while those in B are original. From a study of the statistics set out below the writer has ventured to make certain suggestions with regard to the debated question of the extension of a Scandinavian ice-sheet over Britain.
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References
page 433 note 1 Glacialist's Magazine, vol. iii, 1895–1896, opp. p. 136.Google Scholar
page 434 note 1 Lamplugh, G. W., “Larger Boulders of Flamborough Head,” Proc. Yorks. Geol. Poly. Soc., vol. xi, 1888–1890, p. 233.Google Scholar
page 434 note 2 “Sources of Yorkshire Boulders,” Geol. Mag., 1901, p. 19.Google Scholar
page 437 note 1 B.A. Report, 1908, p. 243.Google Scholar
page 437 note 2 Lamplugh, G. W. and Harker, A.,“Drifts of Flamborough Head,” Q.J.G.S., vol. xlvii, 1891, pp. 409–10.Google Scholar
page 438 note 1 Glacial Geology of Great Britain and Ireland, 1894, p. 234.Google Scholar
page 438 note 2 “Sources of Yorkshire Boulders,” Geol. Mag., 1901, p. 19.Google Scholar
page 439 note 1 “Scandinavian Drift of the Durham Coast,” Q.J.G.S., vol. lxxi, 1915, p. 53.Google Scholar
page 439 note 2 In the discussion on Trechmann's paper, Q.J.G.S., vol. lxxi, 1915, p. 80.Google Scholar
page 439 note 3 “Deposit of Interglacial Loess, etc.,” Q.J.G.S., vol. lxxv, p. 185.Google Scholar
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page 441 note 1 Trechmann, C. T. (Q.J.G.S., 1919, pp. 178–81) states that the upper surface of the Scandinavian B. Cl. is contorted by later ice. Also (p. 185) that he does not think it certain that the Scandinavian B. Cl. of Warren House Gill is the equivalent of the Basement Clay of Holderness as in the latter Scottish and English rocks are mixed up with the Norwegian.Google Scholar
page 442 note 2 Sheppard, T. and Muff, H. B., “Glacial Geology of Robin Hood's Bay,” Glac. Mag., 1896–1897, p. 50, state: “With regard to the Norwegian erratics, these are usually, though not always, in small pebbles, well-rounded and having no flaws or cracks. They are occasionally ice-scratched, and in some cases have a beautiful‘sole’.”Google Scholar
page 442 note 3 On the beach at Filey the writer picked up a rounded pebble, 1 in. in diameter, of red porphyritic essexite, which, in tho hand, is unlike any of the Scottish eseexites, and is probably of Norwegian origin.
page 443 note 4 Mr. A. Jesson of the Danish Geological Survey states that pink flints do not occur in either the Cretaceous rocks or the drifts of Denmark (note from B.A. Rep., 1899, p. 400).Google Scholar
page 445 note 5 Black flints are unknown in the local chalk and Bel. lancolata is also unknown, B.A. Rep., 1898, p. 552. See also footnote 4, p. 443.Google Scholar
page 449 note 6 The majority of boulders recorded in this paper were collected from gravel pits in operation or from arable land where there would be little likelihood of human transport. In the discussion on this paper A. E. Salter drew attention to the rounded character of the small boulders of rhomb porphyry.
page 449 note 7 The quartz-porphyry identified as Dalecarlian by Professor Sjögren is in Rastall and Romanes' later paper (1909) stated to be not Scandinavian, and is later identified in Whealler's paper (1921) as a Scottish dyke-rock of Old Red Sandstone age.
page 452 note 19 “Scandinavian Indicator-Boulders,” Dan. geol. Undersg., ii, No. 23, 1909, p. 125.Google Scholar
page 453 note 1 “Scandinavian Drift of the Durham Coast,” Q.J.G.S., vol. lxxi, 1915, p. 72.Google Scholar
page 453 note 2 “The Glaciation of North Cleveland,” Proc. Yorks. Geol. Soc., vol. xvi, pt. 3, 1908, pp. 372–82.Google Scholar
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