22 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 461 



PLEISTOCENE SERIES Thickness 



WISCONSINAN STAGE (feet) 



WOODFORDIAN SUBSTAGE 

 Peoria Loess 

 5. Loess, leached, tan-brown; Modern Soil. 4.0 



SANGAMONIAN STAGE 



Glasford Formation 

 Berry Clay Member 

 4. Accretion-gley; Sangamon Soil. 3.0 



ILLINOIAN STAGE 



JUBILEEAN SUBSTAGE 



Glasford Formation (continued) 

 Radnor Till Member 

 3. Till, tan-brown to gray; leached in upper part; calcareous in 



lower part, cobbly, massive. 10.0 



Toulon Member 

 2. Silt, coarse, laminated, tan; sparsely fossiliferous; grading 



downward into sand with some gravel at base. 8.0 



MONICAN SUBSTAGE 



Glasford Formation (continued) 

 Hulick Till Member 

 1. Till, calcareous, massive, tan and gray. 40. 



Total 6 5.0 



LONG LAKE STRATIGRAPHIC SECTION 



Measured in several creek bank exposures, center of NWj NWj Sec. 18, 

 T. 2 N., R. 2 E., Schuyler County, Illinois (1962). 



PLEISTOCENE SERIES Thickness 



ILLINOIAN STAGE (feet) 



Glasford Formation (undifferentiated) 

 7. Sand, grading downward into sand and gravel, leached, red- 

 brown to tan-brown; strongly developed Sangamon Soil in top. 14.0 

 6. Till, calcareous, massive, tan to gray. 10.0 

 5. Till, calcareous, gray; contains blocks of calcareous fossil- 

 iferous silt from below; silt composes more than half of the 

 deposit. 3 o 

 Petersburg Silt 

 4. Silt, clayey, calcareous, gray and tan; contains fossil gastropods; 

 caliche nodules occur in distinct bands; sharp contacts at top 

 and bottom. 5. 

 KANSAN STAGE 



Banner Formation 

 3. Silt, sandy, clayey, leached, dark gray, tough, massive; this 

 unit is part of the Yarmouth Soil, but a well defined B-zone was 

 not recognized. 4.0 



2. Silt, clayey, sandy, leached, gray-green, tough, massive; 



sharp contacts at top and bottom. 3.0 



