Note 165 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES
Reading edition
Silurian System, p. 229.
[166] Messrs. Lapworth and Watts, op. cit. p. 318.
Reading edition
Silurian System, p. 229.
[166] Messrs. Lapworth and Watts, op. cit. p. 318.