496 



/. ANDREW BRUSH EL 



of it has a sheet of small water-worn pebbles. Occasional subangular 

 and planed bowlders are found in the clay beneath the pebbly sheet. 

 The largest pebble found in this section by the writer is a chert shown 

 in Fig. 2, E. Its dimensions are 13 by 10 by 8 centimeters. 



On Meramec St., north of the Workhouse quarry, there is an out- 

 crop of till on the south and east faces of the bluff. The deposit lies 

 on the St. Louis limestone, and beneath loess 20 to 25 feet thick. The 

 line of contact between loess and till is a sharp one. With the possible 



Fig. 3. — Pebbles from the bowlder clay of St. Louis. A, ferruginous chert; 

 B, felsite; C, sandstone. Reduced to about one-fourth natural size. 



exception of Wheeler's section at West Pine Boulevard and Taylor 

 Ave., the material at Meramec St. is more pebbly and bowldery than 

 any till heretofore described as lying beneath the St. Louis loess. 

 The sheet in the Meramec St. section is 2 to 3 feet thick, and contains 

 bowlders a foot in diameter. Bowlders from 8 to 1 2 inches are quite 

 numerous. Some of them show both planed and polished surfaces. 

 Several bowlders of granite, including a biotite granite of medium 

 texture and others of a coarse, pegmatitic nature, have been found 

 here. They not infrequently show planing, but are always much 

 weathered inside. 



