GLACIAL DRIFT UNDER SAINT LOUIS LOESS 495 



which had evidently come from outcrops in Calhoun and Lincoln 

 counties, a few miles up the valley. "It remains an open question 

 whether the ice sheet reached into northern St. Louis County from 

 the Illinois side of the river." 



So far as the writer knows, the foregoing is the sum total of reported 

 investigation of a glacial drift under the St. Louis loess. It is the 

 purpose of this paper to present additional evidence of a true drift 

 in the above-mentioned region. 



Fig. 2. — Pebbles from the bowlder clay at St. Louis. A and B, quartzite; C and 

 D, greenstone; E, chert. Reduced to less than three-eighths natural size. 



At the quarry near Grand Ave. and Rutger St, may be seen a 

 section of till resembling the material described by Todd. On the 

 south side of the quarry the drift sheet is 4 feet thick, and hes on the 

 deeply decayed St. Louis limestone. On the west side of the quarry 

 the till is from 2 to 3 feet thick. The overlying loess has a thickness 

 of from 12 to 17 feet. In places the contact between the loess and 

 the clay is sharply defined (see Fig. i) . This clay differs from the 

 loess in color, texture, and composition. It is red rather than buff 

 colored, compact, and very sticky when moist. The upper portion 



