Subject ASC0003sh5
The geological magazine, or, Monthly journal of geology.
[Decade 1]:v. 8 (1871), Page 389 (1871)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32578686
Keywords
Geological section geology carboniferous shales joints carboniferous shale cliff Shales Robert L. Jack ironstone seams rock rectangle lines