Problems, Middle Mississippi River Region, Pleistocene Time 
25-30 feet 
Loess, buff to gray. 
a alrite ee 
3 feet 
Brown till. 
1 foot 
Stratified silt. 
6 feet 
Mottled brown till, showing 
imperfect stratification; eleva- 
tion of bas 480 feet. 
PN AES a eee 
30 feet 
Gray till. 
Base of drift at 450 feet. 
fe ge OER ena 
Pennsylvanian shale base un- 
xposed. 
Ee 
ee TABLE IV 
ction of drift in the Alton Brick Company _— pit at Edwardsville, 
Madi 
son County, Illinoi 
