Note 209 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE
Reading edition
See the interesting account of these tuffs given by Sir A. Ramsay, Mem. Geol. Survey, vol. iii. 2nd edit. p. 142.
Reading edition
See the interesting account of these tuffs given by Sir A. Ramsay, Mem. Geol. Survey, vol. iii. 2nd edit. p. 142.