Note 105 — Chapter XI · THE CAMBRIAN VOLCANOES OF NORTH WALES, THE MALVERN HILLS AND WARWICKSHIRE
Reading edition
See for example, Prof. Bonney, Quart. Journ. Geol. Soc. vol. xxxv. (1879), p. 312; Mr. Blake, op. cit. vol. xliv. (1888), pp. 277, 287. But some at least of the supposed "slates," as stated in a previous footnote, have been since shown to be dykes.
[106] Mr. Blake, ibid. p. 277.