Subject ASC0003tjj
The geological magazine, or, Monthly journal of geology.
n.s. decade 4, v. 1 (1894), Page 484 (1894)
Smithsonian Libraries
BHL Page 30749597
Keywords
groundlayers section vertical band bathing-cots river hodder stonyhurst waterschoot van der gracht van der gracht wm limestone roof lenticular mass nodule carbonaceous shale trilobite seam block stones grit layers