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II.—The Red Zone in the Basaltic Series of the County of Antrim

Published online by Cambridge University Press:  01 May 2009

Grenville A. J. Cole
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Extract

One of the most beautiful features at the Giants' Causeway, from an artistic as well as a geological point of view, is the broad red zone that divides the Lower from the Upper Basalts. As is well known, this zone of lithomarge, bole, and laterite is remarkably persistent in north-eastern Ireland, and represents an interval of Eocene time when volcanic activity was lessened and when the basalts ceased to appear at the surface. At the same time, however, sporadic eruptions of rhyolite occurred, and some of the cones of acid lava supplied material for an interbasaltic conglomerate of rhyolite pebbles, which was discovered several years ago by Mr. A. McHenry near Glenarm.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 8 , August 1908 , pp. 341 - 344
Copyright
Copyright © Cambridge University Press 1908

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References

page 341 note 1 See SirGeikie, A., Anniversary Address, Quart. Journ. Geol. Soc. London, vol. xlviii (1892), Proc., p. 168Google Scholar; and McHenry, , Geol. Mag., 1895, p. 260.Google Scholar

page 341 note 2 “Report on Geology of Londonderry, etc.,” Dublin, 1843, pp. 145–6.Google Scholar

page 341 note 3 “On the Geology of the County of Antrim, with parts of the adjacent Counties,” Proc. R. Irish Acad., vol. x, p. 307.Google Scholar

page 341 note 4 “On the Iron-ores associated with the Basalts of the North-East of Ireland,” Quart. Journ. Geol. Soc. Lond., vol. xxvi (1870), pp. 155 and 158.Google Scholar

page 342 note 1 Mem. Geol. Surv. to Sheet 14 (1886), pp. 20 and 22. Cf. SirGeikie, A., “Ancient Volcanoes of Great Britain,” 1897, vol. ii, p. 204.Google Scholar

page 342 note 2 Mem. Geol. Surv. to Sheet 7 and 8.

page 342 note 3 Ibid. to Sheets 21, 28, and 29, p. 29.

page 343 note 1 “The Rhyolites of the County of Antrim; with a note on Bauxite,” Trans R. Dublin Soc., vol. vi, p. 108.Google Scholar

page 343 note 2 Op. cit., Proc. R. I. Acad., vol. x (1869), p. 303.Google Scholar

page 344 note 1 “Inquiry into the consistency of Dr. Hutton's treory, etc.”, Trans. R. Irish Acad., vol. ix (1803), p. 458Google Scholar. See also “On the alterations … in the Structure of Rocks, on the surface of the basaltic Country in the counties of Derry and Antrim,” Phil. Trans. Roy. Soc. (1808), pp. 195 and 200.

page 344 note 2 Appendix I, p. 11. in Dubourdieu, , “Statistical Survey of the County of Antrim,” Dublin, 1812.Google Scholar

page 344 note 3 “One the Geological Features of the North-Eastern Counties of Ireland,” Trans. Geol. Soc. London, vol. iii (1816), p. 186.Google Scholar