Note 169 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES
Reading edition
See Mr. W. W. Watts on the Igneous and Associated Rocks of the Breidden Hills, Quart. Journ. Geol. Soc. vol. xli. (1885), p. 532.
Reading edition
See Mr. W. W. Watts on the Igneous and Associated Rocks of the Breidden Hills, Quart. Journ. Geol. Soc. vol. xli. (1885), p. 532.