64 
IOWA ACADEMY OF SCIENCE Voi,. XXIX, 1922 
it is difficult to determine with the knowledge at hand. Insuffi- 
cient exposures and lack of thorough investigation up to the 
present time make it impossible to come to definite conclusions. 
To the writer it seems not at all unlikely that the region south of 
the Kaw valley has been glaciated. The topography is flat, the 
slopes are gentle, hence exposures are few. What lies below the 
general siltlike covering has not been determined. Like the 
Iowan ice sheet, the edge of the Kansan undoubtedly was thin 
and more or less sluggish as the till where it is known north 
of Kaw river is relatively thin and patchy, having been made 
more attenuated by post-Kansan erosion. 5 According to Todd 
“Only scattered boulders can now be found, where till patches 
may have once been a few feet in thickness.” 6 
In view of the fact that the till in Kansas is in general thin and 
patchy, the topography is flat and the exposures are few, it is not 
unreasonable to believe that very careful and detailed research 
may favor the hypothesis that the Kansan ice sheet extended 
farther south than the Kaw valley. 
View 2 . Lobate extension of the Kansan ice sheet south of Lin- 
wood and Lenape. — The outcrops of till do not necessarily imply 
that the entire glacier invaded the region south of the Kaw valley. 
The deposits can readily be accounted for by the deposition of a 
glacier lobe which pushed its way farther to the south than did the 
main mass of ice. As indicated by Todd “There is some evidence 
that the ice sheet in Kansas was more or less lobular in form, at least 
after it passed over the divide into the Kansas valley. One lobe 
passed down . . . the Big Stranger to Linwood and Len- 
ape.” 7 It is apparent from the map, figure 1, that the exposures 
of the glacial materials are in almost direct north and south align- 
ment with Big Stranger creek and the town of Linwood. May it 
not be that the lobe referred to above extended farther to the 
south than suggested by Todd? The position of the outcrops in 
relation to Big Stranger creek and Linwood certainly is very 
suggestive. 
Before finally accepting the view set forth, more detailed search 
would be necessary as the apparent alignment of the outcrops with 
the Linwood-Lenape lobe may be due to accidental discovery of the 
exposures of the deposits rather than to actual conditions. Further 
research may reveal other till-like deposits south of the Kaw. 
5 Loc. cit. p. 35. 
6 Loc. cit. p. 35. 
7 L,oc. cit. p. 44. 
