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tion of 2 to 5 feet of shale, with an irregular thin bedded seam of Coal A 

 and the Millstone Grit. Some of the layers contain a few fossils. The 

 following comprise all that could be it'cognized : Orthls umbraculum. 

 Archimides wortheni, Athyris subtilita, Pentremites obessus, P. pyriformis, 

 Spirifer incrassatus, Productus carbonarius, P. cora, and au abundance of 

 encrinite stems. It belongs to the upper member of the sub-carboniferous 

 limestone, and is designated by Prof. A. H. Wortheu in the Geological 

 Report of Illinois as the Chester Group. 



"The greatest development of this limestone seen in Greene County, is 

 on Beech Creek, a branch of Richland Creek, on section 12, township 7, 

 range 4, where it forms a great mural precipice, capped with sandstone of 

 the Millstone Grit series. The following section was obtained at this 

 locality : 



"P>rownish-gray sandstone, in thick beds which has the ap- 

 pearance of being most excellent building stone 25 feet in. 



Shale, which thickens up to many feet and in places contains 



Coal A 1 In. 



Buff colored limestone in which I saw Pentremites obessus, 



P. pyriformis. and Archimides wortheni 20 feet 



(Jray silicioiis shale, partly covered 25 feet 



Bluish limestone (in which I saw no fossils, with intercala- 

 tions of sandstone, mostly covered by talus 50 feet 



Total 120 feet 1 in. 



"At the junction of the sandstone and limestone at this locality, there 

 gushes forth a mammoth spring of good cool water 



"The sub-carboniferous limestone makes its appearance at the base of 

 the hills along this creek for a distance of several miles, and is overlaid 

 by a few feet of shales and the massive sandstone at the base of the Mill- 

 stone Grit. It also makes its appearance at the ore banks on Ore Branch 

 of Richland Creek in section 28, township 7, range 4, and on the eastern 

 border of the county line near the Virginia blast furnace along Richland 

 Creek." 



Professor Cox has probably mistaken the heavy sandstone above the 

 middle limestone for the Millstone Grit (Mansfield sandstone), and has con- 

 fused the limestones. 



