Subject ASC0001dgh
The Quarterly journal of the Geological Society of London.
v.49 (1893), Page 148 (1893)
Natural History Museum Library, London
BHL Page 45958754
Keywords
rock Volcanic rock vulcanic rock cracks surface Basalt Rocks Spheroidal line drawings showing distinguishing shapes on volcanic rocks volcanic rocks geology rocks basalt Port Oer volcanic diabase Dwyrhos