LOESS AND THE IOWAN DRlET. 365 



In Iowa City, in the brickyard east of Lucas and north of 

 Ronalds streets, a yellow fossiliferons loess streaked more or less 

 with pale blnish-gray, fifteen feet in thickness, overlies a fossili- 

 ferons pale bluish loess, two to six feet in thickness, which is 

 evidently post-Kansan and pre-Iowan. The latter rests on 

 somewhat sandy gumbo. 



Similar loesses occur at a number of points west and south- 

 west of Iowa City. Some of the striking examples are the 

 following: 



In the southwest quarter of section 7, T. 79 N. R. 6 W., a 

 yellow loess (post-Iowan) caps a fossiliferous pale bluish loess 

 (post-Kansan) which is exposed to a depth of six or eight feet. 

 The gully in section 12, T. 79 N., R. 7 W. , noted by McGee, 

 shows similar loesses, the line between them being quite dis- 

 tinct, and the lower resting on a gumbo-like clay which over- 

 lies Kansarj drift. 



In the southwest quarter of section 23, T. 79 N., R. 7 W., 

 about three feet of yellow loess overlie about three feet (all 

 that is exposed) of pale bluish loess containiug nodules and 

 tubules, but no fossils. 



A cut along the diagonal road in the northeast quarter of 

 section 20, T. 79 N., R. 6 W., exposes seven feet of yellow loess 

 resting on pale bluish-gray fossiliferous loess. In the south- 

 west quarter of the same section an exposure shows yellow 

 loess resting directly on gumbo. 



Near the north-central part of section 30, T. 79 N., R. 6 

 W., the two loesses are very distinct. 



A cut along the road north of the church in the northeast 

 quarter of the northwest quarter of section 27, T. 79 N., R. 7 W., 

 shows Kansan drift, or Buchanan gravel, at the base, then 

 about a foot of gumbo, then the pale-blue post-Kansan loess, 

 one to one and a half feet in thickness, then yellow loess four 

 to five feet. A long cut along the road near the center of 

 section 17, T. 79, N., R. 6 W., shows yellow, post-Iowan, 

 loess resting directly on gumbo, but the upper slope shows a 



