GEOLOGY OF OHIO. 727 



at the point where the railroad crosses Yellow Creek. At the Empire 

 Mine, it is apparently wanting, as the air shaft shows a limestone 

 twenty feet above the coal mined (No. 6). This limestone is apparently 

 the same as that seen at the railroad bridge, and as there without any 

 coal above it. In a boring made at the Empire Mine, limestone four 

 feet thick occurs immediately beneath the fire-clay of the coal, just as 

 in the central and eastern portions of Columbiana county. At Irondaie 

 coal No. 7 is 2^ feet thick ; at CoUinwood, from 3 to 4 feet; at Linton, 

 where it is known as the " Groff Coal," from 3 to 4^ feet. Along the 

 river between Yellow Creek and Wills Creek, Coal No. Tj appears at 

 various places — Elliotsville, Sloan's Station, Brown's Station, etc. — 

 and varies from 2\ to 4 feet in thickness. At Fleming's Mine, above 

 Brown's Station, it is very well shown and 4 feet thick. At Wills Creek 

 it has come down nearly to the level of the river, and is three feet in 

 thickness. At Yocum's Well, just south of Wills Creek, it is reported to 

 have been passed in boring, and to have been 'about 2 feet thick. At 

 and below Steubenville, it is either wanting or too thin to be worked. 



On the south side of the river. Coal No. 7 has apparently been identi- 

 fied at Tomlinson's Run, and at New Cumberland, and is there from 3 to 

 5 feet in thickness. 



The interval between Coal No. 7 and the " Big Vein " — No 6, is at 

 Salineville from 50 to 62 feet ; at Irondaie it is 50 feet ; at CoUinwood it 

 is reported to be 35 feet only ; at Linton 65 feet ; at mouth of Wills 

 Creek it is 62 feet. 



Coal No. 6. — The "Big Vein" of the northern part of Jefiferson county, 

 the " Shaft coal " of Steubenville and Rush Run, is the thickest and most 

 valuable coal found in this region. Its thickness at Salineville varies 

 from three to six feet, at Kirk's salt well showing the latter, while at the 

 Empire Mine the maximum thickness is five feet nine inches, average 

 thickness about five feet. At Irondaie it is five and a half feet, at Linton 

 six to seven feet, at Steubenville it is four feet in thickness, at LaGrange 

 five and a quarter feet, and at Rush Run six to nine. In all the north- 

 ern part of the county the coal of seam No. 6 is highly cementing, and 

 contains considerable sulphur. At Steubenville it is a very pure, par- 

 tially open-burning coal, largely used, when coked, for the manufacture 

 of iron. This seam is rarely homogeneous and almost always shows a 

 parting of slate or bony coal at or below the middle. 



Coal No. 5.— This is known on Yellow Creek as the "Roger Vein." It 

 is there from two and a half to three and a half feet in thickness, of 

 medium quality, and has been worked only for local use. The in terval 

 that separates No. 5 from No. 6 is quite variable, ranging from thirty-five" 



