CHAPTER XIII. The Eruptions of Llandeilo and Bala Age

The Eruptions of Llandeilo and Bala Age

i. The Builth Volcano--ii. The Volcanoes of Pembrokeshire--iii. The Caernarvonshire Volcanoes of the Bala Period--iv. The Volcanic District of the Berwyn Hills--v. The Volcanoes of Anglesey--vi. The Volcanoes of the Lake District; Arenig to close of Bala Period--vii. Upper Silurian (?) Volcanoes of Gloucestershire 202