Subject ASC0003tcv
The geological magazine, or, Monthly journal of geology.
Decade 3:v. 4 (1887), Page 18 (1864)
Smithsonian Libraries
BHL Page 30751413
Keywords
geology rock-structure cone-in-cone Permian breccias W. S. Gresley Cone-in-Cone cones coal-measures silico-ferruginous sandstone cone-in-cone structure Cone in cone structure