Note 84 — Chapter IX · CHARACTERISTICS OF THE CAMBRIAN SYSTEM IN BRITAIN
Reading edition
Proc. Camb. Phil. Soc. vol. iii. (1877), p. 89. The Cambrian volcanic areas of North Wales are represented in Map II.
Reading edition
Proc. Camb. Phil. Soc. vol. iii. (1877), p. 89. The Cambrian volcanic areas of North Wales are represented in Map II.