PLEISTOCENE RECORD OF THE SIMPSON COLLEGE WELL. 
BY JOHN L. TILTON. 
The record briefly stated. 
The record stated in detail. 
The post-Kansan surface deposits. 
The suh-loessial sand. 
The Kansan drift. 
The Aftonian deposits. 
Gravel from the snh-Aftonian (Nebraskan) drift. 
Carboniferous. 
The water. 
Discussion. 
PLEISTOCENE RECORD OF THE SIMPSON COLLEGE WELL. 
BY JOHN L. TILTON. . 
In the summer of 1907 a series of four wells were sunk within a radius 
of fifteen feet on the campus of Simpson College, giving Ihe best record 
which it has been possible to obtain in the county. This record, made as 
the material was removed, is here presented in detail. It serves as a typ- 
ical record down* to the Aftonian, beyond which the deposits described 
are not commonly reported within the county. The surface of the 
well is at 970 feet, A. T. 
The record briefly stated. 
2 ft. Soil, black (loess and humus). 
28 ft. Loess yellow above, blue below; then blue clay (gumbo, a 
modified loess) ; then a grayish blue sandy loess; no efferves- 
cence. , 
2 ft. Sand, yellowish and gray. Sub-loessial. 
54 ft. Clay, with pebbles, bowlders and lime concretions ; yellowish 
brown for one foot, then grayish blue for seventeen feet, then 
bluish black for thirty-six feet. Kansan. 
25 ft. Deposit, black, with old soil plains and minute partings of 
vegetation, but no wood, and almost no pebbles. 
1 ft. Pebbles from sub-Aftonian (Nebraskan) drift. 
112 ft. (Ends on the Carboniferous). 
The record stated in detail. 
