The Ancient Volcanoes of Great Britain, Volume 1 (of 2)Note 198 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGEReading editionMem. Geol. Surv. vol. iii. 2nd edit. pp. 126, 128, 131, 139, etc.◇Copy noteReturn to CHAPTER XIII THE ERUPTIONS OF LLANDEILO AND BALA AGE