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Published online by Cambridge University Press: 01 May 2009
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.
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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
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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.
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