Note 268 — Chapter XIV · THE SILURIAN VOLCANOES OF IRELAND

This area was mapped by Mr. J. Nolan for the Geological Survey, and was described by him in the Geol. Mag. for 1879. I visited it in company with my colleagues, Mr. B. N. Peach and Mr. A. M'Henry, in 1890 and again in 1894. My first conclusion was that the volcanic rocks should be regarded as part of the schistose series lying to the north of them (Pres. Address Geol. Soc. 1891, p. 77). But on the second visit, after having studied the rocks of the border of the Scottish Highlands, I formed the opinion stated in the text.