216 Transactions of the Academy of Science of St. Louis 
Ficure 16. Drift on Watkins Creek a few hundred yards south of U. &. 
highway 66 and about a mile west of Chain-of-Rocks, St. Louis. This 
is the same section as shown in Table VI. This may be of pre-Illinoian 
age, or it may be Iilinoian drift intermingled with Lafayette gravel. 
