Subject ASC0003tzt
The geological magazine, or, Monthly journal of geology.
n.s., decade 4, v. 5 (1898), Page 219 (1864)
Smithsonian Libraries
BHL Page 30745772
Keywords
fault llanberis railway purple slate slate green slate slickensides fault conglomerate grit geology rock stone layers soil numbers circles symbols aeration layer fold strata cutting purple green slickenside