Subject ASC0001h52
The Quarterly journal of the Geological Society of London.
v.60 (1904), Page 476 (1904)
Smithsonian Libraries
BHL Page 35259970
Keywords
rocks chart silica-percentages gravities rhyolite geology silica specific gravity Bedded rocks percent silica specific gravities silica percentage rock igneous rocks Pontesford Hill bedded rocks silics percentages andesite grits palagonite-tuff halleflinta lava breccias Bedded Rocks Specific Gravity Silica Percentages Rock Specimens Silica Table