188 Kansas Academy of Science. - 



below the surface, variation being according to the inequalities 

 of the surface and the hardness of the underlying rock. 



The next level is a little higher than the flood plain near St. 

 George, and marks the lower limit of erosion of the larger 

 streams previous to the formation of the lake. It corresponds 

 to the limits of such valleys. One of those valleys seems to 

 have come south from Rock creek to St. George, another from 

 the Big Blue northwest, and a third from the direction of Man- 

 hattan. 



Mr. Oscar Talbot, who has drilled numerous wells in that 

 region, says that the main supply of water is found in a few 

 feet of gravel, which on the divide south of Rock creek is 160 

 feet below the surface. He refers the springs west of St. 

 George, including one piped into town, to this source. 



The third and highest level is between Wamego and St. 

 George, lying east of the old Rock creek channel mentioned 

 above. Its general height above the river south is 120 to 159 

 feet, with some points probably a little higher west of Wamego. 

 Its lower portions seem to correspond to the bottom of a chan- 

 nel and the higher points to parts of the banks. 



On the southeast flank of this higher portion, about a mile 

 southwest of Wamego, there is a clear exposure of the second 

 level, and at Wamego the lowest level underlies the town, while 

 an intermediate level between the two and corresponding to a 

 narrow silt terrace, rising 35 to 40 feet higher, is indicated by 

 wells. 



3. B Dividers. 



Red quartzite bowlders, similar to ledges in southwestern 

 Minnesota, with occasional bowlders of gray granite and green- 

 stone, may be met with throughout the basin, particularly on 

 higher points, but with the following limitations : 



(1) They are more abundant in a belt one to two miles wide, 

 extending in a S. S. E. direction from the forks of Rock creek, 

 passing two miles west of Wamego. Along this belt they are 

 more abundant in patches. As they rest on sand and clay, 

 erosion has caused them to stand out on knolls in such a way as 

 to simulate quite closely morainic hills. Further west they are 

 less numerous, and are usually found resting on the surface of 

 the Carboniferous bedrock. They are often deeply covered 

 with lacustrine clay. 



