230 GEOLOGY OF ILLINOIS. 



believe that the upper seam of coal at the above locality is No. 8, and 

 the lower one No. 7.* 



Section of the bluff at Nicomb's. Dip of strata, 5° N., 20° E. 



Ft. In. 



Schistose sandstone 5 



Coal rash, No. 8 ? 1 



Fire-clay, good for stoneware and fire-brick 3 



Argillaceous shale 11 G 



Coal No. 7? reported to be 2 (i 



23 6 



About three-quarters of a mile south-west of Nicoinb's the following 

 section was obtained, the dip of the strata being the same as at the 

 above locality : 



Ft. 



Strewed with chert, top of hill 20 



Thick bedded sandstone, with some pebbles 60 



Covered slope, strewed with sand rock 80 



Eed of creek 



160 



The sandstone in this section, which is inferred to be the Conglomer- 

 ate, on account of finding a few pebbles in it, was followed along the 

 dip until it disappeared beneath the strata at Nicoinb's. 



Goal No. S°! The coal at the village of Stone Fort, in the south-west- 

 ern corner of the county, is referred to this number and horizon, but 

 not without some doubt on the subject, for it is just on the margin of 

 the basin, where the seams are subject to much variation, both as regards 

 the quality of the coal and the thickness of the strata. Therefore, 

 unless it is seen in connection with No. 7, especially where so little has 

 been done to develop the coals, it is not always possible to distinguish 

 the former from the latter bed. At the village of Stone Fort the strata 

 dip a little east of north at an angle of 20°, which, taken in connection 

 with the dip of the rocks at the old fort, about two miles to the east, 

 appears to indicate that this village also is on the prolongation of the 

 Gold Hill axis of Gallatin county. The following section was taken at 

 the village of Stone Fort : t 



Ft. In. 



Sandstone.- — 15 



Bluish silicious shate 2 



Yellowish argillaceous shale and yellow clay 1 6 



Coal rash, No. 8? 3 6 



Friable silicious shale 10 



Soft flaggy stone in cube-like blocks .*.. 2 



34 



* These are probably divisions of coal No. 1 or 2, both of which are occasionally divided, forming 

 two distinct seams. A. H. W. 



i This section may be compared with that given in the report on Williamson county, on page 114, 

 the section being in the bluff back of the village of stone Fort now called Bolton, where coals 2 and 3 

 have been opened in the face of the blufi A. H. W. 



