420 ROLLIN T. CHAMBERLIN 
and during which time geologic thought has progressed more and 
more toward the conception of a solid globe, it now seems worth 
while to put the ideas briefly into print: Objection will, of course, 
at once be made by many to any prolongation of shearing planes 
S. 
iy t. 
0 ©. 
RoE AMICON 
Fic. 1.—The continental wedges. Section through Washington, Chicago, Salt 
Lake, Mt. Shasta, Australia, and South Africa. Surface relief exaggerated and 
diagrammatic. Drawn in gto. 
deeply beneath the surface. The tenacity of the idea of easy flow- 
age in the depths is remarkable. The idea of a molten interior, 
though disclaimed in name by most of those who follow closely the 
development of geologic science, is yet followed unconsciously, in 
fact, to some degree at least by most of them. On the other hand, 
