HENDERSON COUNTY. 283 



Some of the lower layers of the heavy limestone beds furnish a beautiful 

 stone of a light brown or yellowish tint, that dresses w^ll. This is largely 

 used for window caps, sills, etc. Large quantities of rock are sent from here by 

 the railroad into Warren, Knox and Peoria counties. The material for the 

 second class masonry of the Burlington railroad bridge, crossing the Missis- 

 sippi, was from these quarries ; the rest of the material coming from Joliet. 



Northeast of Sagetown, in section 10, there are outcrops which furnish con- 

 siderable quantities of stone, both for lime and building purposes. Farther up 

 the bluff, and along the Henderson river, the rock has been worked in section 

 2, of the same township ; also, sections 35, 25 and 24, township 11, range 5. 

 In section 25, at Mr. Bosler's quarry, I obtained the following section : 



FEET. IN. 



1. Slope, with outcrops of limestone ? 



2. Limestone 3 



3. Sandstone and chert 1 3 



4. Limestone 6 4 



5. Arenaceous limestone 4 



6. Limestone 10 



7. Shaly limestone and sandstone, with chert 6 3 



8. Calcareous sandstone, with chert 1 3 



9. Shaly limestone 6 



10. Chert 6 



11. Limestone 8 



12. Chert and shaly limestone 8 2 



13. Limestone 6 



14. Shaly limestone and sandstone, with chert 3 



15. Limestone 1 6 



16. Chert 11 



17. Slope, with outcrop of limestone 15 



In the northeast quarter of section 25 there are extensive outcrops. At 

 this point, on the farm of Mr. Jenks, there is a crevice in the rocks known as 

 Jenks' cave. A portion of it has been destroyed in quarrying the rock, but 

 for ten or fifteen feet from the entrance it is from six to nine feet high, when 

 it suddenly becomes smaller. It has been penetrated about seventy-five feet. 



Along North Smith creek the beds of the Burlington limestone form exten- 

 sive ledges. Some of the lower and softer layers having been worn away by 

 the combined action of the atmosphere and the water, the upper layers are 

 frequently left projecting, in some cases, quite a number of feet. Quarries 

 have been opened in these ledges, at convenient points, in sections 19, 20 and 

 21, township 11, range 4. Considerable of the rock at these quarries has a 

 yellow or reddish brown color, other portions are light-colored, and make a 

 very pretty building material. In section 19, on the north side of the creek, 

 where the Drift had been removed so as to expose the upper surface of the 



