BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 4 



Figure 1. — View in an aba? 



:d gravel Pit near Doris, Buchanan County, Iowa 



Below the markers is a thick bed of Buchanan gravels, only partially exposed. When 

 the pit was worked the gravel was taken out down to the blue Kansan till. Above the 

 markers is a bed of typical Iowan. S to 10 feet thick. The Iowan necomes thinner 

 toward the left and thicker toward the right. 



Figure 2. — The young, uneroded Iowan Drift Plain, with characteristic granite 

 Boulders. View east of Wimthrop, Iowa 



GLACIAL PHENOMENA IN BUCHANAN COUNTY, IOWA 



