[Footnote 49: Report, 1886, Part D, p. 84.]

[Footnote 50: Report, 1885, Part B, p. 67.]

[Footnote 51: _Bull. Geol. Soc._, Vol. 13, pp. 305-352.]

[Footnote 52: _Id_., p. 336.]

[Footnote 53: _Id_., p. 336.]

Quite recently this region has been studied by Marius R. Campbell of the
Washington Survey Staff (Bulletin 600), while the part in Alberta has
been studied by Rollin T. Chamberlin of Chicago. Much of the vast area
involved is not yet well explored; but over it all, so far as it has
been fully examined, the same lithological and stratigraphical
structures reappear with the persistence of a repeating decimal. And
were it not for the exigencies of the theory of Successive Ages, this
whole region of some five or six thousand square miles would be
considered as only an ordinary example, on a rather large scale, of
undisturbed horizontal stratification cut up by erosion into mountains
of denudation, with of course occasional instances of minor local
disturbances here and there, as would be expected over an area of this
extent.

Richards and Mansfield in a recent paper describe the "Bannock
Overthrust," some 270 miles long, in Utah, Idaho, and Wyoming. The
Carnegie Research recently reported a similar phenomenon about 500 miles
long in northern China.