Subject ASC0003tg6
The geological magazine, or, Monthly journal of geology.
Decade 3:v. 7 (1890), Page 342 (1890)
Smithsonian Libraries
BHL Page 30522324
Keywords
fossil Keswick England didymograptus fracture keswick slates slate graptolites skiddaw Didymograptus v-fractus salter outerside