In all parts of Canada where the Paleozoic strata come in contact with the underlying Archean rocks the latter appear to pass beneath them with very much the same contour or slope as that of their modern surface. It appears evident that these ancient stratified or laminated rocks have been tilted to their present high angles, and that their included intrusive masses, whether of granite or greenstone, and even most of their dikes, have occupied their present positions relatively to each other before the commencement of Paleozoic time, excepting in cases where faulting has taken place. Not only is this so, but at that early date they appear to have been worn down by denudation to something like their present superficial aspect.
What has become of the vast amount of débris resulting from this denudation ? This is a problem of American geology which . . .