292 University of Kansas Geological Survey. 
these hills rather than to rise to an elevation of 1550 feet, which is 
even higher than the divide between the Kansas and the Neosho 
river in the flint hills of Wabaunsee county, which are now con- 
sidered to be quite above and south of the terminus of the ice sheet. 
Professor Udden in the article above referred to suggests that 
the waters which deposited these beds must have connected with 
another body of water in the valley of the Smoky Hill river to the 
north, and states that the river has cut its channel through these 
deposits. 
The elevation of the McPherson divide at its central point is a 
trifle over 1500 feet. To the southward at a distance of thirty 
eight miles the Arkansas river flows at an elevation of a little over 
1400 feet, or a fall of 100 feet in thirty eight miles. The bed of the 
Smoky Hill river eight miles farther north is 1300 feet. The city 
well at McPherson, starting 1475 feet above sea level, was put down 
150 feet (the present water supply is taken from a depth of 140 feet) 
without striking the bottom of the deposit. This makes the bottom 
of the well 25 feet above the bed of the Smoky Hill river two miles 
south of Lindsborg, or about the same level as the bed four miles east 
of Marquette, still on the northern boundary of the Equus beds. 
The present elevation of the Arkansas river at the mouth of the 
Little Arkansas is 1290 feet. This difference of elevation of the two 
rivers iS party due to the fact that the Smoky Hill flows nearly 
east across the north end of the beds while the Arkansas flows 
southeast, making its distance greater in crossing the southern 
end of the formation. The relation of the two river beds and the 
records of the McPherson and Halstead wells is shown on section 
4, figure 4, Plate XLVI. The section begins at the mouth'of Sharp’s 
creek and passes along the western edge of McPherson and a trifle - 
east of Halstead to the Arkansas. It will be seen at a glance that 
the two rivers are at the same level at the extremities of the eleva- 
tion and that the gravel in the McPherson well lies in exactly the 
same level, while the gravel of the Halstead well passes below it. 
The fact should also be borne in mind that the Arkansas river has 
reached its base level and filled its channel to some extent, though 
how much is not definitely known. 
The above figures would seem to indicate that at one time the 
