WARREN COUNTY. 295 



At or near Monmouth, a boring was made, but I was unable to obtain a copy 

 of the journal of the work, though it waa promised me. As nearly as I could 

 learn, only about ten inches of rotten coal was found. It is probable that it 

 will be necessary to go farther east or south to find any place where the seain 

 will prove workable.* 



It is doubtful whether the lower seam can be found underlying No. 2 through- 

 out the county, but still it may, and probably does exist all along the eastern 

 border. At the outcrop in Henderson county, a few miles southwest of Ellison, 

 coal No 2 lies but a short distance above the lower formations, and the same 

 may prove to be the case along the southwestern portion of this county. Still, 

 a seam, which is probably No. 1, is found but a short distance northeast of 

 Ellison. In searching for coal, either by sinking a shaft or otherwise, it should 

 always be borne in mind that, when any of the beds of Lower Carboniferous 

 limestone are reached, it is useless to go deeper in search of it. 



Burlington Limestone. The beds of this group immediately underlie the 

 Coal Measures in this county, wherever the junction of the coal with the under- 

 lying beds can be seen. In the south part of the county, there may be thin 

 beds of the St. Louis between them, and east of Biggsville, and near Young 

 America, the Keokuk may be present, but there are no outcrops where either 

 can be seen beneath the Coal Measures. 



The Burlington group, in Warren county, consists mainly of light gray and 

 brown limestones, with some layers of sandstone, chert and calcareous clay shale, 

 and attains a thickness of from forty to fifty feet. These beds outcrop along 

 the small streams in the southern part of township 12, range 3. Section 31 

 furnishes layers of good building material, sufficiently thick for all ordinary 

 purposes. In sections 32 and 33, it is thin bedded where it has been worked. 

 In section 35, at Kockwell's mill, on Cedar creek, the rock is quite arenaceous. 

 When the quarries were first opened they afforded good limestone, but on work- 

 ing into the bluff, the beds are changed to a soft or rotten sandstone. This 

 exposure of the strata gave the following section : 



FEET. IN. 



1. Limestone and sandstone 15 6 



2. Sandstone 17 



3. Green, argillaceous sand 1 



4. Shales of Kinderhook to the bed of the creek 17 



East of this, in sections 19, 20, 29 and 30, township 12, range 2, the Bur- 

 lington limestone outcrops along some of the small streams, and is overlaid by 

 thin strata of the Coal Measures. As far as exposed here, it is somewhat arena- 



*Since this report was made, Dr. A. W. Black, of Monmouth, has sunk a shaft to the coal, 

 which was found at the depth of about forty feet below the surface. The shaft is a little east 

 of the city, and the coal found to be from twenty-four to thirty inches in thickness and of excel- 

 lent quality. This is probably coal No. 2 of the Fulton county section. A. H. W. 



