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Published online by Cambridge University Press: 01 May 2009
In connection with the revision of the Silurian area in Ireland, at present in progress by the staff of the Irish branch of the Geological Survey, a number of rock-specimens of the dykes occurring on the coast of Co. Down were lately petrographically examined by the writer, who detected in one of the slices a blue amphibole of secondary origin. As a mineral of this kind was not hitherto known to occur in sitû in Ireland, it may be of interest to put its discovery on record here and to give also a few details respecting its characteristics.
page 257 note 1 Cat. Camb. Sil. Foss. Woodw. Mus., 1872, p. 12Google Scholar.
page 258 note 1 These sediments were originally regarded as Lower Silurian. The recent revision (by Mr. F. W. Egan), however, shows them to be Upper Silurian. Report of Director-General of Geol. Survey, Appendix to 44th Report, Dept. of S. and A., p. 365Google Scholar.
page 258 note 2 By Mr. Traill, W. A., who mapped the dykes in this district. See Memoir of Geol. Survey to accompany 1′ sheets 49, 50, and 61 (1871), pp. 6 and 43Google Scholar.
page 260 note 1 Amer. Journ. Sci., vol. xxxix (1890), p. 359 et seqGoogle Scholar.
page 260 note 2 Amer. Journ. Sci., vol. xlii (1891), p. 505Google Scholar.
page 260 note 3 Trans. Roy. Soc. Edinburgh, vol. xxxix (1900), pt. iv, p. 884Google Scholar.
page 260 note 4 Bull. Dept. Geol. Univ. California, 1894, p. 181 et seqGoogle Scholar.
page 260 note 5 16th Ann. Rep. U.S. Geol. Survey, 1894–1995, pt. ii, p. 30Google Scholar.
page 260 note 6 System of Mineralogy, 6th edition, 1892, p. 402Google Scholar.
page 260 note 7 Die Gesteine der Grorudit-Tinguait-Serie, 1894, p. 33Google Scholar.
page 260 note 8 Die mikro. Phys. der petro. wichtigen Min., 3rd ed., 1892, p. 567Google Scholar.
page 260 note 9 Translation of the last work by Iddings, 1898, p. 270Google Scholar.
page 260 note 10 Loc. cit., p. 189.
page 260 note 11 Mikro. Phys. d. massigen Gesteine, 1896, p. 510Google Scholar.
