ILLINOIAN AND KANSAN MOLLUSCAN FAUNAS 19 



Thickness 

 (feet) 

 1. Till, calcareous, dark blue-gray, bouldery; to level of creek 



channel. 5. 



Total 46.8 



BRIAR BLUFF SOUTH STRATIGRAPHIC SECTION 



Measured in roadcuts, SWcor., NW| Sec. 21, T. 17 N., R. 1 E., Henry 

 County, Illinois (1957). 



PLEISTOCENE SERIES Thickness 



WISCONSINAN STAGE (feet) 



WOODFORDIAN SUBSTAGE 

 Peoria Loess 

 8. Loess, massive, leached, yellow-tan to light brown; Modern 



Soil in top. 9.0 



7. Loess, massive, calcareous, yellow-brown, friable, some 

 CaC0 3 concretions; lower 5 feet mottled with gray and con- 

 tains abundant fossil snails (Leonard and Frye, 1960). 12.5 

 6. Loess, gray, compact, calcareousi weakly calcareous in 

 lowermost 1/2 foot; brown mottling and a few limonite con- 

 cretions; sparsely fossiliferous. 2.0 

 FARMDALIAN SUBSTAGE 

 Robein Silt 

 5. Silt, gray, locally calcareous; contains zones of dark humic 



silt that have been distorted by cryoturbations . 2.0 



ILLINOIAN STAGE 

 LIMAN SUBSTAGE 



Glasford Formation 



Kellerville Till Member 

 4. Till, clayey, rusty red-brown, compact, leached; B-zone of 



Sangamon Soil. 4. 



3. Till, tan and gray, leached, massive, compact. 2.5 



2. Till, calcareous, gray; streaks and spots of light brown. 6.5 



Petersburg Silt 

 1. Silt, massive, calcareous, gray and tan conformable with till 



above; locally contains limonite laminae; contains fossil snails. 3. 



Total 41.5 



CASEY NORTH STRATIGRAPHIC SECTION 



Measured in borrow pit on north side of Interstate Highway 70, SW| SE-j 

 SW^Sec. 8, T. 10 N., R. 14 W. , Clark County, Illinois (1970). 



