-MOKUIK M. LEIGHTON 



ally good condition for inspection. Because of the exceptional phenomena 

 shown, some of which have not heretofore been noted, a detailed description 

 was made, which will be presented and discussed herewith. 



LOCATION 



So far as can be determined from the post-office map of Tazewell 

 County, the Farm Creek exposure is located near the south line of the SE. 

 J4, Sec. 30, T. 26 N., R. 3 \\\, on the south side of the stream and just easl 

 of the Toledo, Peoria & Western Railway bridge. The small stream swings! 



Fig. 1. — Diagram of the stratigraphic successions at the 

 Farm Creek exposures. (1). Illinoian till; (2). Illinoian gum- 

 botil; (3). Sangamon loesslike silt; (4). Old soil (Sanga- 

 mon); (5). Peorian loess; (6). Shelby ville till; (7). Bloom- 

 ington gravel; (8). Post-Bloomington loess. 



against the south valley wall at this place and undercuts actively enough to 

 keep the face of the exposure fairly clean. At the time of visit the face was 

 somewhat freer of slump than it was when the photograph previously re- 

 ferred to was taken. 



DIMENSIONS AND FORM 



The cut is about 100 feet high. 225 feet long in an east-west direction, 

 and, with the exception of minor details, it still has about the same form as 

 shown in Dr. Calvin's photograph. The general form and sequence of 

 materials is sketched in the accompanying diagram ( Fig. 1 ) . 



