PRE-ILLINOIAN TILL IN SOUTHERN ILLINOIS 15 



ever, are none too good, and their interpretation is consequently difficult. 

 He is at present disposed to correlate this older drift with that found near 

 Ste. Genevieve, Missouri, and to refer it to the earliest glaciation rather than 

 to the Kansan. 



With the evidence at hand of Labradorian pre-Illinoian drift in the 

 La Salle and Hennepin 5 and Springfield" quadrangles in central Illinois, it 

 is most plausible to include the pre-Illinoian drift near Schuline with that 

 of the eastern ice-cap. 



G. H. Cady, "Geology and Mineral Resources of the La Salle and Hennepin Quad- 

 rangles," Bull. 37, III. State Geol. Survey (1919), p. 71. 



6 E. W. Shaw and T. E. Savage, "The Tallula-Springfield Quadrangle," V. S. Geol. 

 Survey, Folio No. 188 (1913), p. 7. 



