Note 92 — Chapter X · THE CAMBRIAN VOLCANOES OF SOUTH WALES
Reading edition
The occurrence of these dykes is paralleled by that of the similar intrusions in the quartz-felsite of Llyn Padarn to be afterwards described.
Reading edition
The occurrence of these dykes is paralleled by that of the similar intrusions in the quartz-felsite of Llyn Padarn to be afterwards described.