WISCONSINAN MOLLUSCAN FAUNAS 25 



BANNER SECTION 



NWf NE5- sec. 10, T. 6 N. , R. 5 E. , Fulton County, Illinois 

 Measured in new cuts along Highway 9, 1958 



Pleistocene Series Thickness 



Wisconsinan Stage (feet) 



Woodfordian Substage 

 Peoria loess 



4. Loess, massive with local platyness, medium, yellow-tan- 

 gray, calcareous (P-118); upper 8 feet leached in 



surface soil; contains fossil snails (locality 15). 18.0 



Farmdalian Substage 

 Farmdale silt 



3. Silt, massive to platy, purple-brown to purple-gray, 



noncalcareous; charcoal flakes in upper part (P-117 



upper; P-116 lower). 5.0 



2. Sand, silt, and a few pebbles, massive, yellow-tan at 



bottom grading upward to gray-brown; locally weakly 

 calcareous; colluvium (P-115). 2.0 



Illinoian Stage 



1. Till, compact, pebbly, gray and tan, calcareous (P-113); 



contains included blocks of gray silt with a few 



fragmentary snail shells; upper 2 feet leached (P-114), 



appears to be truncated soil. 20.0 



Total Pleistocene 45.0 



BLUFFDALE SECTION 

 NW? NWi sec. 3, T. 10 N. , R. 13 W. , Greene County, Illinois, 1953, 

 overburden of abandoned quarry 



Pleistocene Series Thickness 



Wisconsinan Stage (feet) 



Woodfordian Substage 

 Peoria loess 



4. Loess, massive to indistinctly bedded, gray-tan, weakly 



calcareous, sparsely fossiliferous; gradational at base; 

 basal contact and indistinct bedding dip away from 

 valley. 15.0 



Altonian Substage 

 Roxana silt 



3. Loess, massive, pink, weakly calcareous to noncalcareous; 



basal contact forms arch in truncated spur; contains 

 several pods of Celt is occi'lentalis seeds and fossil 

 snails (locality 46). 20.0 



2. Silt, massive, gray and gray-tan mottled, scattered 



angular chert fragments. 3.0 



1. Rubble of angular chert fragments with random orientation 



in a clay matrix, covered at the base. 4.0 



Total Pleistocene measured 42.0 



BROWNS MOUND SECTION 



NEi SEi sec. 27, T. 14 N. , R. 13 W. , Scott County, Illinois, 1958-9, (i mile 

 southwest of deep cuts along Hwy. U. S. 36, studied and collected in 1953 and 

 1955). Section as exposed in August 1958 and May 1959. 



Measured by John C. Frye, A. Byron Leonard, and H. B. Willman 



