242 OC. M. Wetherill on the Artesian Weil of Lafayette, Ia. 
Feet. Inches. Remarks, ay 
Sand and gravel...........+.. 3 ain 
Clay and pebbles............. 6-8». aif 
Gravel and pebbles ........... 5 
eee es 6 A 6 soa e a7 0 40 
ME OE oS 5 oe cna Os es 2 To shale 170 feet. 
LY gE PSR SCR rae 18 Iron pyrites in all the rock 
Be a ee ee ccc as : ae formation. ey 
| See a ee 7 Thickness of shale 28 ft. 6m. 
Limestone—coralline ......... 11 6 To coralline, 198 ft. 6 in. 
Gray limestone with spar...... 20 Overflowing water. 
P 
Depth of well from original surface 23 
as the lowest capacity of this leak. We found that the weer 
of overflow was caused by the leak having been ine 
i storin, 
arrested the leak by tamping and puddling at the end vr 
tube below it, but were fearful of preening difficulties ap rd 
3 ; means of 
top of the shale rock had always existed, we had pat derived 
tube. ray 
e leak was at length arrested by the following deen as It 
own, which I submit in the event of a future need f0r™ — 
proved simple and successful in the Lafayette well, ant The 
not aware that it has ever been employed in a similar case. 
