264 THE ILLINOIS GLACIAL LOBE. 



was a plain at about this level prior to the Iowan invasion. In the neigh- 

 boring township on the south buried soils are reported in sees. 14, 15, and 

 20, at 675, 710, and 720 feet above tide, which are probably Sangamon. In 

 the village of Elburn a buried soil occurs at 790 feet above tide, which 

 is perhaps Peorian. 



In Dekalb County only a few instances of, buried soil were collected. 

 These are nearly uniform in elevation at slightly less than 800 feet above 

 tide and are slightly lower than the plain outside the Wisconsin drift. It 

 seems probable that they should be referred to the Sangamon soil, at the 

 junction of the Iowan and Illinoian. A buried soil is found, beneath the 

 Iowan drift, outside the limits of the Wisconsin, in the vicinity of Deer- 

 field, at about the same elevation. 



In southeastern Lee County soils occur at a level lower than the plain 

 outside the Wisconsin drift, three instances being found where the elevation 

 is 720 to 740 feet, while the plain is about 800 feet aboA r e tide. These 

 seem referable to the Sangamon stage. One instance was found in sec. 34, 

 T. 39, R. 2 E , of the occurrence of a buried soil at about the elevation of 

 the outer-border plain; this may be referable to the Peorian. 



In northwestern Lasalle County there are many instances of the occur- 

 rence of soil at 600 to 650 feet. This low elevation would suggest its 

 reference to the junction of the Iowan and Illinoian rather than the base of 

 the Wisconsin. This soil horizon is well preserved in eastern Bureau 

 County. It seems to be quite uniform in elevation over several townships 

 in which the surface of the Wisconsin has a variation of more than 100 feet 

 in altitude. 



In the counties south from Bureau County the Iowan drift has not 

 been recognized, and possibty it does not reach these counties. No records 

 were obtained which show buried soil either in Putnam or in Marshall 

 County. In Woodford County wells in the vicinity of Metamora pass 

 through a soil and enter a hard till at about 140 feet, or at an elevation of 

 680 feet above tide. A coal shaft at Minonk, in the eastern part of the 

 county, passes from soft till into hard till at about the same elevation, 

 thouo-h the depth of soft till there is only 62 feet. It is probable that in 

 both of these instances the soil is referable to the Sangamon. In northern 

 Tazewell County exposures were found, both in the Illinois bluff and along 

 Farm Creek, where the loess occurs beneath the Wisconsin drift at an 



