STUDIES IN GLACIAL GEOLOGY IN SAINT LOUIS 

 AND VICINITY.* 



J. Andrew Drushel. 



In the Journal of Geology, October, 1908, the writer 

 of this note gave a resume of the work done on the drift 

 beneath the St. Louis loess up to 1908. Later N. M. 

 Fenneman^ described drift two miles north of the pump- 

 ing station at the Chain of Rocks. The section is said 

 to show the presence of two drift sheets with a layer of 

 stratified clay between. The lower is said to be Kansan, 

 and the upper, Illinoian. 



During the past two years the writer has re-examined 

 the sections described in his former paper and has found 

 a number of new sections ranging from the exposures 

 north of the Chain of Rocks to Soutli St. Louis, a dis- 

 tance of fifteen miles. 



It is the purpose of this paper to describe several new 

 sections typical of the numerous exposures which may 

 be found in this region, to show the glacial origin of the 

 Chain of Rocks l)luffs, and to suggest the possibility of 

 three ice sheets in St. Louis and St. Louis County. 



On the north and west faces of Kemp's quarry, near 

 Minnesota avenue and Delor street, one block east of the 

 Bellefontaine car sheds. South St. Louis, may be seen 

 an exposure of drift six to eight feet thick, lying on top 

 of the clean-swept St. Louis limestone and beneath loess 

 fifteen to twenty feet thick. (See Fig. 1.) The line of 

 contact between the loess and the drift is remarkably 

 sharp, which is opposed to the idea that the jointed bowl- 

 der clay gradually passes into loess. This contact is so 



* Presented before The Academy of Science of St. Louis, March 20, 

 1911. 



•N. M. Fenneman. Bull. 111. Geol. Surv. 12: S-9. 1909. 



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