Note 139 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES
Reading edition
Quart. Journ. Geol. Soc. vol. xlv. (1889), p. 436; Geol. Mag. (1890), p. 447. Pres. Address Geol. Soc. 1890, p. 107.
Reading edition
Quart. Journ. Geol. Soc. vol. xlv. (1889), p. 436; Geol. Mag. (1890), p. 447. Pres. Address Geol. Soc. 1890, p. 107.