LASALLE COUNTY. 49 



Ft. In. 

 No. 19. Fire-clay and shale 50 



No. 20. Coal No. 5 ,. 5 



No. 21. Fire-clay 3 9 



No, 22. Sandstone 5 4 



No. 23. Darkredehale 2 6 



No. 24. Sandstone and sandy shale i 42 11 



No. 25. Shale 71 



No. 26. Gray clay shale 18 6 



No. 27. CoalNo.2 3 6 



Total depth 464 10 



Both the lower seams are worked in this shaft, and they furnish 

 all the coal mined in the vicinity of LaSalle or Peru at the present 

 time, but it is quite probable that when a careful examination of the 

 upper seam is made, it will be found to afford, at some points, a 

 fair quality of coal. It is unquestionably the representative of either 

 No. 6 or 7 of the general section, and both of them are extensively 

 mined in other portions of the State. 



Whether the Streator coal, and the upper seam in the shafts at 

 LaSalle and vicinity, are identical, is a point I have been unable to 

 decide with certainty, as no fossils were found associated with the 

 latter at the only localiiy where its outcrop could be seen, and the 

 associated strata afford no satisfactory evidence on this point. 



The character of the deep-lying formations beneath the southern 

 part of LaSalle county was fully determined by the artesian boring 

 at Streator, and I am indebted to Dr. E. Evans for the following 

 record of this well : 



Ft. 

 No. 1. Drift-clay, sand and gravel 30 



No. 2. Coal Measures 211 



No. 3. Trenton limestone 203 



No. 4. St. Peters sandstone 225 



No, 5. White Iim3stone 90 



No. 6. White sandstone 133 



No. 7. White limestone 211 



No. 8. White sandstone 37 



No. 9. Dark gray limestone 50 



No. 10. Fine reddish sandstones 15 



No. 11. Dark gray limestone 13 



No. 12. White and brown sand 1 



No. 13. Gray limestone 18 



No. 14. White and brown sandstone. 168 



No. 15. Blue shale 100 



No. 16. Dark limestone ^ 73 



No. 17. Variegated sandstone 187 



No. 18. Soft limestone 60 



No, 19. Variegated seales 158 



No. 20. Dark red sandstone 80 



No. 21. Blue shale 50 



No. 22. Bluish, drab and buff limestone 383 



Totaldepth.. 2,496 



