WARREN COUNTY. 293 



A. costata, Bellerophon Montfortianus, Rhynchonella Eatoniseformis^Pleurotoma- 

 ria Grayvillensis, P. sphserulata, var. depressa, Nautilus, and some others not 

 recognized. 



Of these, the following species also occur in the upper Coal Measures : 

 Spirifer cameratus, Spiri/erina Kentuckensis, Allorisma subcuneata, Aihyris sub- 

 tilita, Edmondia ovata, Lima retifera, Schizodus curtus, Pleurotomaria Grayvillensis, 

 Sellerophon Montfortianus. 



A little west of this point and in the same section, the roof is black slate, a 

 few inches thick, and is overlaid with limestone. Here the coal is but about 

 three feet thick. In the western part of this section, the seam is from three 

 and a-half to four feet thick, with a roof similar to the last. Did not learn the 

 thickness of the limestone, but, judging from the exposures in some old quar- 

 ries, it must be several feet. At these mines, sandstone underlies the coal. 

 Besides these, there are other mines in this township, in sections 15, 22 and 23. 



In township 12, range 1, there are a number of mines which probably belong 

 to this seam. The exposures in sections 21, 22 and 27, showed 1 foot 6 inches 

 of coal overlaid by 2 feet-of soft clay shale. 



There are also mines in sections 29, 30 and 32. As these are worked only 

 during cold weather, I was able to make but little examination of them, as I 

 visited this neighborhood in the summer. In township 12, range 2, the only 

 mines in this seam are in sections 10 and 15. I am indebted to Mr. Chicken 

 for the following section of the strata penetrated by his shaft : 



FEET. IN. 



1. Soil and clay, about 4 



2. Sandstone 5 



3. Light colored clay shale 4 



4. Dark blue clay shale 4 



5. Compact calcareous clay shale 1 6 



6. Chert 1 6 



7. Clay 2 



8. Dark colored limestone 6 inch, to 2 



9. Coal, average 2 8 



In section 4, township 9, range 3, the coal is reported to be two feet two 

 inches thick. As it lies below the bed of the stream, it is worked by means 

 of a shaft. A shaly limestone lies but little above the coal, but I was unable 

 to learn whether there is any slate between them. This mine is just south of 

 the road on the township line, and on the other side of the road this limestone 

 has been quarried. Here I obtained Productus longispinus, P. semireticulatus, 

 Avicidopecten, Naticopsis, and some other fossils. 



In township 9, range 1, on the southwest quarter of section 24, this seam 

 crops out in the bluffs of Slug run, on the Peabody farm. The coal is about 

 three feet thick, and overlaid by a dark, bluish limestone. About ten feet be- 

 low this seam, there is an outcrop of the Burlington limestone, but the inter- 



