IOWA ACADEMY DF SCIENCE 
211 
with Mr. Greene’s consent. It demonstrates on the spot that the top 
of the Hertha limestone is fifteen feet below the Bethany Falls lime- 
stone at the falls itself: 
Driller’s Terminology. 
Interpretation. 
Thickness. Depth. 
Soil .................... 
Falls limestone Bethany Falls limestone . . . 
Shale, with some thin limestone.. Ladore shale 
Limestone Hertha limestone 
Sandstone, hard, loose grained. .. Top of Pleasanton 
Sandstone, open, coarse grained 
Ft. 
22 
8 
15 
6 
15 
28 
Ft. 
22 
30 
45 
51 
66 
94 
