IOWA ACADEMY OF SCIENCES. 277 



Kansan drift. This bed is not cut up into irregular blocks 

 by the presence of such numerous joints and cracks as 

 appear in the clay found in Number 3 above. At the top 

 of this number, just below the soil band, the calcareous 

 matter has been entirely leached out for a depth of eigh- 

 teen to twenty-four inches. At a depth of thirty inches 

 from the top there is in some places a slight action in 

 response to hydrochloric acid, and in the other places at 





'-d^^^ 



/ 





Fig. 16. Drift exposure along the C. & N. W. Ky. , lu-ar Toledo, Iowa, 



the same depth the acid produces no action whatever. 

 At a depth of three feet the acid usually produces slight 

 effervescence. At four feet in depth the action with 

 acid is still stronger than at three, while at a depth of six 

 feet from the top, and so on down to the base of the expos- 

 ure, the acid never fails to produce a prompt and vigorous 

 action. 



CONCLUSION. 



In the above exposure the following conditions seem to 

 indicate the presence of two different drift sheets. 



