Reprinted from 

 The Journal of Geology, Vol. XXXIV, No. 2, March-April, 1926, pp. 175-180 



PRE-ILLINOIAN TILL IN SOUTHERN ILLINOIS 



PAUL MacCLINTOCK 

 Illinois Geological Survey 



ABSTRACT 



In central Randolph County, southwestern Illinois, a 52-foot cut shows, below 

 Illinoian drift, 12 feet of leached gray loess referred to Kansan time. Below this 

 loess is a much-weathered old till, probably of Nebraskan age, which seems best 

 attributed to ice invasion from the Labrador center. 



INTRODUCTION 



A section of glacial drift, showing undoubtedly pre-Illinoian till, of 

 peculiar interest because of its location farther south than any previously 



Fio. 1. — Index map of Illinois showing location of Schuline exposure 



described pre-Illinoian till, was found in central Randolph County, Illinois, 

 during the first season of Pleistocene studies in southern Illinois. Two 



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