Note 425 — Chapter XLVII · THE ACID BOSSES OF MULL, SMALL ISLES, ST. KILDA, ARRAN AND THE NORTH-EAST OF IRELAND
Reading edition
Sheet 70 of the Geol. Surv. Map of Ireland and Explanation thereto; also Journ. Roy. Geol. Soc. Ireland, vol. iv. (1877), p. 233; Geol. Mag. 1878.