Lansing Pleistocene Geology. — Winclicll. 
279 
In order, however, that this transition from the features 
of the loess to those of the lowan till may be made to appear 
widespread, as it is, the writer will add (besides the remarks 
on the discussion of the South Dakota drift by professor 
Todd, given under No. 14) the following references : 
Professor T. C. Chamberlin, indorsed the idea of the trans- 
ition, horizontal and vertical, of the lowan till to loess in his 
introduction to the last edition of Geikie's "Great Ice Age." 
Jour. Geol, vol. 3, p. 2^3, i8p^. 
Professor J. E. Todd, in his description of "the moraines 
of southeastern South Dakota" (Bull. No. 158, p. 93) men- 
tions, among the relations of the drift to the loess, a gradual 
passage from one to the other, essentially similar to that de- 
EXPLANATIOH 
One. H>iLr"i>tcH= SrtET 
MOUTH or THE TUNNEL 
C/ifl50N;rrRoys limestone 
(OWAN LOZSS 
. . , ROTTED PEBBLES 
o ROTTED LIMESTONE PreBLES 
Fig. 3. Section of the tunnel parallel with the cross-cut of Mr. Fowke. 
scribed by N. H. Winchell in 1877, in southwestern Minne- 
sota. There are numerous statements of facts, and some il- 
lustrations by figures, in the same w^ork, that lead to the same 
idea. Professor Todd also quotes Chamberlin to the same 
effect. (Missouri Geol. Survey, vol. 10, p. 210, 1896.) 
Professor Calvin, in his report on Page county, (Geology 
of Iowa, vol. XI, p. 446, 1900) clearly describes the pebbly 
drift-loess of McGee, under the heading "flooded valley de- 
posits." "In nearly all the valleys of Page county there is. 
a formation which in some of its phases resembles loess ; but 
in other of its aspects it is clearly an aqueous deposit. It has 
