320 GEOLOGY OP ILLINOIS. 



FT. IN. FT. IN. 



4. Calcareous iron ore 2 3 



5. Clay shale 2 3 



6. Limestone 6 to 9 



7. Clay shale 1 3 



8. Limestone 2 



9. Arenaceous shale 3 



10. Limestone 2 to 3 



11. Clay shale 6 6 



12. Black slate 3 



13. Coal 1 S to 3 



14. Clay. Not measured 



The limestone, Nos. 2, 6, 8 and 10, contain a greater or less percentage of 

 carbonate of iron. From the shales and limestones were obtained Producing 

 Prattenanus, P. Nebrascensis, Athyris subtilita, Chonetes mesoloba, Lingula 

 umbonata, and other fossils. 



West of the river, in township 10, range 3, this seam is worked in sections 

 8, 16, 18, 19 and 29, also in township 10, range 2, in sections 14, 22, 23, 25, 

 26, 27, 29, 33 and 34. In section 33,. along Hog creek, specimens of " cone-in- 

 cone" were found in considerable quantities. West of this the coal has been 

 found in sections 10, 14 and 23. The exposure in the bluffs of Brush creek, in 

 the northeast quarter of section 14, gave : 



FT. IN. 



1. Sandstone. Not measured 



2. Shale. Not measured 



3. Black slate. Not measured 



4. Clay shale 6 6 



5. Coal 2 2 



6. Clay shale or clay 3 



7. Sandstone. Not measured 



Nos. 1, 2 and 3 of the above sections were only exposed sufficiently to de- 

 termine their lithological characters, but not so as to be accurately measured. 

 The following section was obtained in section 10 : 



FEET. 



1. Clay or shale. Not measured 



2. Coal 3 to 6 



3. Clay or shale 7 " 9 



4. Coal No. 3 5 " 6 



5. Clayshale 20 



6. Coal No. 2 2 



7. Sandstone. Not measured. 



Seams that appear to be the same as Nos. 4 and 6 of this section, are worked 

 in section 23, and the plants obtained from the overlying shales of the upper 

 bed, are the same as are found elsewhere in connection with No. 2. This 

 would indicate that the lower coal might be No. 1 of the general section of the 



