The Ancient Volcanoes of Great Britain, Volume 1 (of 2)Note 124 — Chapter XI · THE CAMBRIAN VOLCANOES OF NORTH WALES, THE MALVERN HILLS AND WARWICKSHIREReading editionQuart. Journ. Geol. Soc. vol. xxi. (1865), pp. 87-91.◇Copy noteReturn to CHAPTER XI THE CAMBRIAN VOLCANOES OF NORTH WALES, THE MALVERN HILLS AND WARWICKSHIRE