THE ILLINOIAN ICE INVASION 293 



The following records have been referred to the Peorian by Leverett, but 

 in the light of present evidence they would seem to be referable to the Sanga- 

 mon interval: 



Kankakee County; 43 old soil beneath blue till. 



Iroquois County; 44 till underlaid at many points by a black soil and by beds 

 of peat and shell marl; old soil 60-80 feet below the surface. 



Woodford County; 45 Metamora, till 140, muck and sand 15, till 115 feet. 



Douglass County; 46 near Areola, swampy muck below blue tili at about 50 

 feet, harder till beneath. 



Edgar County. 47 



McHenry County. 4 ' 



Kane County; 49 at Elgin shoe factory, old soil at 118 and 113 feet; also at 

 111 and 114 feet; near St. Charles 50 old soils at 72 to 78 feet and 195-200 feet. 51 



DeKalb County;"' 2 several instances of an old soil below the Wisconsin. 



Lee County; 53 old soil beneath 78-100 feet of drift. 



Kendall County; 54 near Piano, old soil containing grass leaves beneath till 

 at depth of 25 feet. Near Melbrook, old soil with wood at 160 feet. 



Dewitt County; 55 a muck bed beneath 80 feet of till, underlaid by green 

 clay, apparently a swamp subsoil. 



Cook County; an old till was encountered in the Chicago drainage canal 

 east of Summit (Leverett). 



Many buried soils occur at different depths, and these have been referred 

 by Leverett to both the Sangamon and the Peoriau intervals. Such occur 

 in Kane, DeKalb, LaSalle, Bureau, McLean, Lee and other adjacent counties. 56 

 These soils occur at depths of from 40-50 to 180-200 feet. In Iroquois County 

 a soil horizon occurs at the base of the soft Wisconsin till, while another is 

 encountered in the harder, Illinoian till. 



43 Leverett, Illinois Glacial Lobe, p. 654. 



44 Op. cit., p. 655. 

 * Op. cit., p. 672. 

 "Op. cit., p. 731. 

 "Op. cit., p. 732. 



48 Op. cit., p. 577. 



49 Op. cit., p. 595. 

 60 Op. cit., p. 597. 



51 This soil is evidently pre-Illinoian or Yarmouth. 



52 Leverett, Illinois Glacial Lobe, p. 600. 

 "Op. cit., p. 610. 



54 Op. cit., p. 644. 

 65 Op. cit., p. 707. 

 ss IUinois Glacial Lobe, pp. 262-266. 



