Subject ASC0001dpr
The Quarterly journal of the Geological Society of London.
v.49 (1893), Page 455 (1893)
Natural History Museum Library, London
BHL Page 45959095
Keywords
Quarry slate quarry Cefn Du felsite conglomerate banded purple slate Slate Quarry. Cefu Du Felsite Conglomerate Banded Purple Slate lithology stratigraphy slate geology branded purple slate cefn du