Subject ASC000240e
The Quarterly journal of the Geological Society of London.
v.45 (1889), Page 247 (1889)
Smithsonian Libraries
BHL Page 36940042
Keywords
chain stellate spherulitoid enclosures quartz felsite rock mineral geology brecciated brecciation deposite perlitic contraction stellate spherulitoid enclosures porphyritic quartz quartz-felsite perlite Stellate spherulitoid Quartz perilitic contraction Pen-y-chain