^{page 176 note *} Quart. Journ. Geol. Soc., vol. vi, p. 60, 1850Google Scholar.

^{page 176 note †} Ibid., vol. xix, p. 180, 1863.

^{page 176 note ‡} Ibid., p. 187.

^{page 176 note §} Ibid., vol. xlvii, p. 74, 1891.

^{page 177 note *} Annual Report Geol. Survey for 1893, p. 266.

^{page 177 note ‡} Barrow, , “On the Occurrence of Silurian (?) Rocks in Forfarshire and Kincardineshire along the Eastern Border of the Highlands,” Quart. Journ. Geol. Soc., vol. lvii, p. 328, 1901CrossRefGoogle Scholar.

^{page 177 note §} Gregory, , “Problems of the South-western Highlands,” Trans. Geol. Soc. Glasgow, vol. xiv, pt. 1, p. 15, 1910Google Scholar.

^{page 177 note ∥} Ann. Rep. Geol. Survey for 1895, p. 26.

^{page 178 note *} Ann. Rep. Geol. Survey for 1896, p. 28.

^{page 178 note †} For Dr Clough's views on this boundary line see p. 209.

^{page 178 note ‡} Trans. Edin. Geol. Soc., vol. viii, pt. 3, p. 315, 1905Google Scholar.

^{page 178 note §} The Geology and Scenery of the Grampians, vol. i, pp. 41 and 194, 1908Google Scholar.

^{page 179 note *} Trans. Geol. Soc. Glasgow, vol. xiv, pt. 1, p. 16, 1910Google Scholar.

^{page 179 note †} Geol. Mag., dec. v, vol. viii, p. 63, 1911;Google ScholarTrans. Boy. Soc. Edin., vol. xlviii, pt. 4, No. 34, p. 927, 1913Google Scholar.

^{page 179 note ‡} Nature, vol. Ixxxix, p. 347, 1912;Google ScholarRep. Brit. Assoc, p. 463, 1912.

^{page 180 note *} The term “Margie” has been applied to the Upper Series in Kincardineshire and Forfarshire by Mr Barrow. See Quart. Journ. Geol, Soc., vol. lvii, p. 328, 1901Google Scholar.

^{page 181 note *} Mem. Geol. Survey: The Geology of North Arran, etc., pp. 18–21, 1903.

^{page 181 note †} Trans. Roy. Soc. Edin., vol. xlviii, p. 926, 1913Google Scholar.

^{page 183 note *} Mem. Geol. Survey: The Silurian Rocks of Britain, vol. i, p. 41, 1899Google Scholar.

^{page 185 note *} Quart. Journ. Geol. Soc., vol. lvii, p. 329, 1901Google Scholar.

^{page 185 note †} This point is discussed more fully in the comparison of the Margie Grits with the Leny Grits on page 200.

^{page 188 note *} Geol. Mag., dec. vi, vol. i, p. 404, 1914Google Scholar.

^{page 188 note †} Monog. Brit. Grap. (Pal. Soc), vol. i, p. 295.

^{page 189 note *} Camb. Brach. (U.S. Geol. Survey Monog., vol. li, pt. 1), p. 378, 1912Google Scholar.

^{page 189 note †} Davidson, , Brit. Fossil Brach. (Pal. Soc), vol. iii, pt. 7, p. 337;Google ScholarMatlet, , Quart. Journ. Geol. Soc., vol. lxvii, p. 301, 1911Google Scholar.

^{page 189 note ‡} Quart. Journ. Geol. Soc., vol. xxxiii, p. 668, 1877Google Scholar.

^{page 189 note §} Ibid., vol. lviii, p. 141, 1902; Davidson, Sil. Brach. (Pal. Soc), Suppl., p. 208, pl. xvii, figs. 31 and 32.

^{page 189 note ∥} Monog. Brit. Fossil Brach. (Pal. Soc), vol. iii, p. 341.

^{page 190 note *} Matley, , Quart. Journ. Geol. Soc., vol. lxvii, p. 302, 1911Google Scholar.

^{page 190 note †} Lapworth, , Proc. Geol. Soc., vol. xv, p. 346, 1888–1889Google Scholar.

^{page 190 note ‡} The Silurian Rocks of Britain (Mem. Geol. Sur.), vol. i, p. 675, 1899Google Scholar.

^{page 190 note §} Walcott, , Camb. Brach. (U.S. Geol. Survey Monog., vol. li, pt. 1), p. 642, 1912Google Scholar.

^{page 190 note ∥} Ibid., p. 696.

^{page 190 note ¶} The Silurian Rocks of Britain (Mem. Geol. Survey), vol. i, p. 675.

^{page 190 note **} Walcott, , Camb. Brach. (U.S. Geol. Survey Monog., vol. li, pt. 1), p. 713, 1912Google Scholar.

^{page 190 note ††} Matley, , Quart. Jour. Geol. Soc., vol. lxvii, p. 303, 1911Google Scholar.

^{page 190 note ‡‡} Ibid., vol. lviii, p. 144, 1902.

^{page 191 note *} Calloway, , Quart. Jmir. Geol. Soc., vol. xxxiii, p. 669, 1877Google Scholar.

^{page 191 note †} Matley, , Quart. Jour. Geol. Soc., vol. lviii, p. 143, 1902Google Scholar.

^{page 191 note ‡} Davidson, , Brit. Fossil Brach. (Pal. Soc), vol. iii, pt. 7, p. 77Google Scholar.

^{page 191 note §} Brit. Silurian Brack., Suppl., p. 217, pl. xvi, figs. 31–33.

^{page 191 note ∥} Ibid., p. 217.

^{page 191 note ¶} Camb. Brach. (U.S. Geol. Survey Monog., vol. li, pt. 2), pl. lxxxiv, 1912Google Scholar.

^{page 191 note **} Ibid., pt. 1, p. 104.

^{page 193 note *} The Silurian Rocks of Britain, vol. i, Scotland (Mem. Geol. Survey), p. 46, 1899;Google Scholar Sir Geikie, A., Ancient Volcanoes of Great Britain, vol. i, p. 201, 1897Google Scholar.

^{page 194 note *} Peach, Rep. Brit. Assoc., p. 453, 1912.

^{page 194 note ‡} Ibid., p. 46.

^{page 194 note †} The Silurian Rocks of Britain, vol. i, Scotland (Mem. Geol. Survey), pp. 45–47, 1899Google Scholar.

^{page 195 note *} Dewry, H. and Flett, J. S., Geol. Mag., dec. v, vol. viii, p. 206, 1911Google Scholar.

^{page 195 note †} Trans. Edin. Geol. Soc., vol. ix, p. 126, 1910Google Scholar.

^{page 195 note ‡} Loc. cit., p. 206.

^{page 196 note *} Trans. Edin. Geol. Soc., vol. viii, p. 323, 1905Google Scholar.

^{page 196 note †} Ibid.

^{page 196 note ‡} Mem. Geol. Survey: Geology of Cowal, p. 73, 1897.

^{page 196 note §} Loc. cit., p. 243.

^{page 199 note *} Mem. Geol. Survey: Geology of Knapdale, etc., p. 88, 1911.

^{page 205 note *} Trans. Edin. Geol. Soe., vol. viii, p. 324, 1905Google Scholar.