18 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 461 



STRATIGRAPHIC SECTIONS 



Following are seven described stratigraphic sections, from which eight of 

 the fauna collections listed here were obtained. The lithologic sample numbers, 

 preceded by P-, refer to samples in the collections of the Illinois State Geological 

 Survey, and mineral analyses of most of these samples are on file. The strati- 

 graphic sections are arranged alphabetically by name. Fourteen additional de- 

 scribed stratigraphic sections that have been published previously are referred to 

 in this report. They are listed with citations following the chart of fauna local- 

 ities in figure 3. Geographic locations of all described stratigraphic sections 

 and fauna localities used in this report are shown on figure 1. 



BIG SISTER CREEK STRATIGRAPHIC SECTION 



Measured in cutbank of Big Sister Creek, SWj NW^ NW| Sec. 8, T. 5 N., 

 R. 4 E., Fulton County, Illinois (sampled 1962). (See also Wanless, 1957, p. 

 209.) 



PLEISTOCENE SERIES Thickness 



ILLINOIAN STAGE (feet) 



Glasford Formation (undifferentiated) 

 15. Modern Soil, gray- brown, leached, friable. 1.0 



14. Till, leached, brownish gray with dark brown on ped 



surfaces; sparse pebbles; Sangamon Soil. 8.0 



13. Till, rusty brown, leached in upper part to calcareous 



in lower; gray in center of joint blocks. 1.7 



12. Till, calcareous, gray. 7.0 



11. Sand, calcareous, reddish to yellowish. 1.5 



10. Silt and sand, calcareous, blue-gray. 1.4 



Petersburg Silt 

 9. Clay and silt, calcareous, dark bluish gray; contains carbon- 

 aceous material and wood fragments. 1.5 

 8. Silt, calcareous, slightly fossiliferous, gray to brownish 



gray; some wood fragments and carbonaceous flecks. 1.7 



7. Sand, slightly calcareous, yellowish to reddish brown; fine 



grained in upper part to coarse grained in lower part. 6.0 



KANSAN STAGE 



Banner Formation 

 6. Gravel, leached, oxidized to yellow-brown to reddish brown; 

 contains Mn-Fe streaks and pellets; truncated Yarmouth Soil, 

 lacking a well defined B-zone. 2 to 4.0 



5. Silt, calcareous, massive, gray; some plant stems and very 

 few shell fragments in upper part (sample P-1368x); middle 

 part laminated dark gray and light gray with abundant but 

 partly crushed gastropod shells; lower part massive and re- 

 sembling the uppermost part of the bed. 3.5 

 4. Sand, calcareous, tan, massive. 0.7 

 3. Silt, clayey, calcareous, gray, massive. 0.8 

 2. Sand, calcareous, reddish, grading downward into gravel, 



partly cemented; uneven lower contact. 5.0 



