BULL. GEOL. SOC. AM. 



VOL. 23, 1912, PL. 10 



Figure 1. — Second Illixois Central Cut east of Sioux Falls 

 a, silt, fossilifei'ous ; 6, weathered drift ( ?) ; c, sandy loess-like stratum 



Figure 2. — Kansan overlain by Silt 

 a, Kansan drift ; h, gray silt ; c, yellowish silt or loam 



SECTIONS IN SIOUX FALLS, SOUTH DAKOTA 



