Ordovician ash-flow tuffs in eastern Snowdonia [by] M.F. Howells, B.E. Leveridge and C.D.R. Evans.
Contributors: Evans, C. D. R.,; Leveridge, B. E.,
Series: Institute of Geological Sciences.  Report no. 73/3; Report (Institute of Geological Sciences (Great Britain)) -- no. 73/3
Publisher: H.M.S.O.
Published: 1973
Place of publication: London
Language: eng
Number of pages: 33
Subjects: Geology, Stratigraphic -- Snowdonia; Volcanic ash, tuff, etc.; Volcanism -- Wales -- Snowdonia