VII.—Differentiation in the Sills of Northern Trotternish (Skye)

Frederick Walker

doi:10.1017/S0080456800016677

VII.—Differentiation in the Sills of Northern Trotternish (Skye)

Published online by Cambridge University Press: 06 July 2012

Frederick Walker

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Frederick Walker: Affiliation:
University of St Andrews.

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The coast of Northern Trotternish has long attracted the attention of geologists for two reasons, the first being the intermittent exposures of highly fossiliferous Jurassic strata preserved below the great Tertiary lava plateau; and the second, the striking columnar sills of igneous rock which have been intruded into these Mesozoic beds. Intrusive phenomena unparalleled in Britain may be observed (preferably from the sea) from Holm to Staffin Bay, and in slightly less perfect form round the Aird to Duntulm and Camas Mòr.

Type: Research Article
Information: Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 57 , Issue 1 , 1932 , pp. 241 - 257

DOI: https://doi.org/10.1017/S0080456800016677 [Opens in a new window]
Copyright: Copyright © Royal Society of Edinburgh 1932

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^{page 241 note *} Description of the Western Islands of Scotland, 1819, vol. i, pp. 275–278Google Scholar vol. iii, map opposite p. 67 and plates 16 and 17.

^{page 241 note †} Essai Géologique sur l'Écosse, 1820, pp. 220 et seq.

^{page 241 note §} Trans. Roy. Soc. Edin., vol. xxii (1861), p. 649Google Scholar.

^{page 241 note ¶} Q.J.G.S., vol. xxxiv (1878), p. 676Google Scholar.

^{page 241 note ††} “Tertiary Igneous Rocks of Skye,” Mem. Geol. Surv., 1904, pp. 237, 385.

^{page 241 note ‡} Q.J.G.S., vol. vii (1851), pp. 108–109Google Scholar.

^{page 241 note ∥} Q.J.G.S., vol. xxix (1873), pp. 328–331Google Scholar.

^{page 241 note **} Ancient Volcanoes of Great Britain, vol. ii (1897), pp. 304–307Google Scholar.

^{page 242 note *} Q.J.G.S., vol. lxxxvi (1930), pp. 355–398Google Scholar; Trans. Roy. Soc. Edin., vol. lvi (1931),pp. 753–766Google Scholar.

^{page 244 note *} Op. cit., pp. 247–251.

^{page 244 note ‡} Walker, F., Q.J.G.S., vol. lxxxvi (1930), pp. 367Google Scholar.

^{page 244 note §} Occasionally (e.g. in the Druim na Slochd sill) it may be of later crystallisation, exhibiting in this case an ophitic relationship relationship towards the plagioclase.

^{page 244 note †} They are then of the Crinan type and may be termed crinanites.

^{page 245 note *} Walker, F., Trans. Roy. Soc. Edin., vol. lvi (1931), p. 757Google Scholar.

^{page 245 note †} Trans. Geol. Soc. Edin.

^{page 246 note *} Trans. Roy. Soc. Edin., vol. lvi (1931), p. 758Google Scholar.

^{page 247 note *} Including migratory serpentine, and therefore only approximately accurate.

^{page 248 note *} Walker, F., Q.J.G.S., vol. lxxxvi (1930), p. 368Google Scholar.

^{page 248 note †} Walker, F., Trans. Boy. Soc. Edin., vol. lvi (1931), p. 760Google Scholar.

^{page 249 note *} Op. cit., p. 251.

^{page 249 note †} MacCulloch, in giving the height of the cascade as 300 feet, is guilty of one of his very rare exaggerations, the true figure being in the neighbourhood of 160 feet.

^{page 251 note *} F. Walker, op. cit., p. 366.

^{page 251 note †} Min. Mag., vol. xii (1929), pp. 114–119Google Scholar.

^{page 252 note *} Evolution of Igneous Rocks, 1928, pp. 151–159.

^{page 252 note †} “Tertiary and Post-Tertiary Geology of Mull,” Mem. Geol. Sun., 1929, p. 33.

^{page 252 note ‡} Loc. supra cit.

^{page 252 note §} Mem. Geol. Surv., Summary of Progress for 1930, pt. ii, pp. 48–50.

^{page 254 note *} “Tertiary Igneous Rocks of Skye,” Mem. Geol. Surv. (1904), p. 248.

^{page 254 note †} Kennedy, W. Q., Geol. Mag., vol. lxviii (1931), pp. 178–179Google Scholar.

^{page 255 note *} A. Harker, op. cit., p. 251.

^{page 255 note †} Mem. Geol. Surv., Summary of Progress for 1930, pt. ii, pp. 61–73.

^{page 255 note ‡} W. Q. Kennedy, loc. supra cit.

^{page 256 note *} Cf. W. Q. Kennedy, op. cit., p. 71 (B).

^{page 256 note †} Op. cit., p. 68.

^{page 256 note ‡} J. V. Lewis, “Ann. Rep. of State Geologist for 1907,” Geol. Surv. of New Jersey, pp. 99–133.

^{page 256 note §} J. V. Lewis, op. cit., p. 121, analyses iv and v.

^{page 257 note *} A. Haeker, op. cit., chap. iii.

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VII.—Differentiation in the Sills of Northern Trotternish (Skye)

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