The Ancient Volcanoes of Great Britain, Volume 1 (of 2)Note 159 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOESReading editionMessrs. Cole and Jennings, op. cit. p. 435.◇Copy noteReturn to CHAPTER XII CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES