Note 205 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE
Reading edition
Mr. Harker, op. cit. p. 127.
[206] Mem. Geol. Surv. vol. iii. 2nd edit. pp. 141, 144, 145, 147, 161.
[207] Bala Volcanic Series, pp. 10, 23, 125. He refers also to lavas occupying a similar position at Nant Gwynant and Moel Hebog; but he adds that he had not had an opportunity of studying them.