The Ancient Volcanoes of Great Britain, Volume 1 (of 2)Note 141 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOESReading editionProf. Cole, Geol. Mag. (1893), p. 337.◇Copy noteReturn to CHAPTER XII CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES