Subject ASC0001tzq
The Quarterly journal of the Geological Society of London.
v.68 (1912), Page 353 (1912)
Smithsonian Libraries
BHL Page 36076679
Keywords
geology structure mynydd-y-gader stratigraphy igneous rock dolerite rhyolite vesicular intrusion Mynydd-y-Gader magma augite ophitic plates fibrous amphibole felspar labradorite epidote calcite iron ores ilmenite leucoxene magnetite apatite pyrite prisms stratification topography rock/ stone layer diagram structure of mynydd-y-gader