680 THE ILLINOIS GLACIAL LOBE. 



INDIVIDUAL WELLS. 



At Oquawka wells are obtained by driving pipes to a depth of 40 to 

 60 feet in the sand of the Mississippi bottoms, and wells of this class, are 

 common throughout the settled portions of these bottoms. 



In the vicinity of Biggsville rock is entered on the uplands at a depth 

 of about 40 feet, but wells are usually obtained at 12 to 30 feet. Similar 

 conditions prevail in the vicinity of Media and Stronghurst, though the 

 drift occasionally exceeds 50 feet. 



Near Decorra, in the southwest part of the county, several wells have 

 been sunk to depths of 90 to 150 feet. They usually enter rock within 100 

 feet of the surface. About 2 miles southeast of Decorra rock is struck in 

 several wells at only 30 feet. 



At Strong-hurst a deep well was drilled by the Stronghurst-Media 

 Company in the winter of 1897-98 with a view to obtain oil. Instead 

 water was obtained, which rises to within 30 feet of the surface, or 643 feet 

 above tide. The log of the well kept by the drillers, Wilson Brothers, of 

 Belleville, Illinois, is as follows (names in parentheses are by the writer): 



Section of an oil boring at Stronghurst, Illinois. 



Feet. 



1. Glacial drift, largely blue clay 150 



2. Gray shale (Kinderhook?) 165 



3. Limestone (Devonian and Upper Silurian?) 105 



4. Shale (Hudson River Group?) 165 



5. Gray limestone (Trenton?) 200 



6. Brown limestone (Trenton?) 15 



7. Gray limestone (Trenton?) 60 



8. Sandstone (St. Peter?) 71 



9. While shale * 25 



10. White limestone 10 



11. White shale 5 



.12. White limestone 24 



13. White sandstone 20 



14. Limestone • 50 



15. Shale 5 



16. Limestone 105 



17. Sandstone 5 



18. Limestone 25 



19. St. Croix (?) sandstone 290 



20. Sandstone 6 



Total 1,601 



There was a strong yield of water in the Trenton and in the sandstone ■ 

 strata at lower depths. 



