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Published online by Cambridge University Press: 01 May 2009
In comparing the quartz-schists with the Devonian sandstones, or grit-bands, several original minerals can be traced from the one to the other, e.g. tourmaline, mica, and at least two quartzes. In the case of the Green Rocks and Devonian Volcanics we are met at the outset with the difficulty, that not a grain or crystal of an original mineral has been recorded with confidence as occurring in the metamorphic Green Rocks; though there seems to be little doubt that the latter are often metamorphosed diabases.
page 289 note 1 Maps indicating the lines of strike of certain of the Diabases and Green Rocks were exhibited by Mr. Ussher, W. A. E. in Section C at the Cardiff Meeting of the British Association, 1891.Google Scholar
page 291 note 1 I regret to say that my own identification of kyanite in the Bolt Schist (Trans. Dev. Assoc. vol. xxi. p. 260) was wrong. I am authoritatively informed that there is no kyanite in any of my slides from that district; the mineral I mistook being probably felspar.Google Scholar
page 291 note 2 Cornwall, Eeport and Devon, , p. 27.Google Scholar
page 291 note 3 Trans. Dev. Assoc. vol. xxi. p. 469.Google Scholar
page 291 note 4 Q.J.G.S., vol. xl p. 7.Google Scholar
page 291 note 5 Brit. Assoc. Rep. 1891.Google Scholar
page 291 note 6 Trans. Dev. Assoc. vol. xi. p. 322.Google Scholar
page 291 note 7 Appendix, slide 40.
page 292 note 1 Since the above was in type I hare been indebted to Mr. Ussher for excellent specimens from the neighbourhood of Banthatn.
page 292 note 2 Rep. Dev. and Cornwall, p. 32.Google Scholar
page 292 note 3 Trans. Dev. Assoc. vol. xiii. p. 172.Google Scholar
page 292 note 4 Trans. Devon. Assoc. 1888, p. 224. A rock from Redlap, in Mr. Somervail's collection, is crowded with macroscopic crystals of typical epidote, associated with a little chlorite.Google Scholar
page 292 note 5 GEOL. MAG. 1889, p. 266.Google Scholar
page 293 note 1 Appendix, slide 33.
page 294 note 1 Appendix, slide 8.