Title: Ordovician ash-flow tuffs in eastern Snowdonia [by] M.F. Howells, B.E. Leveridge and C.D.R. Evans
First published: 1973
Subjects: Geology, Stratigraphic, Snowdonia, Stratigraphic Geology, Volcanic ash, tuff, Volcanism, Wales
LC classification: QE461 H73