234 GEOLOGY OF OHIO. 



The popular belief is that about two feet below No. 4 there is another ' 

 coal eighteen inches thick, but Mr. Ford states that this is erroneous, as 

 the drain is much deeper than two feet. The coal is of good quality and 

 in good repute for domestic use. 



About a mile nearer Cambridge Mr. William Garey has made' %a ex- 

 amination of the bed and finds it only eighteen inches, roofed by fifteen 

 inches of shale, upon which rests a heavy sandstone. 



About a mile north of Cambridge the coal is seen in the road-side eight 

 inches thick, with nodular limestone below it. To the east the coal and 

 limestone become much thicker, the former reaching four feet along the 

 National Road, where there are numerous deserted openings. West and 

 north-west of Cambridge the coal varies so in thickness as to be trace- 

 able with great difficulty. 



Coal No. 7a was observed at a few points, but at no place does it ex- 

 ceed eighteen inches. 



Coal No. 76 was observed at only one locality. It is worked bj' Mr. G. 

 W. Fiester, section 1, above five miles north-east of Cambridge. No good 

 opportunity was afforded to obtain measurements, but the section is 

 about as follows : 



■" FT. IN. 



1. Crinoidal limestone 8 



2. Shale 15 



3. Coal 4 



5. Blackshale 6 



6. Coal 1 6 



The Crinoidal limestone here is very thin, but it retains its fossils in 

 considerablt numbers. 



Knox Township. — In this township we find no workable coal except No. 

 6, which is very nicely displayed along Indian Camp Creek, where it has 

 been opened by T. Wells and J. Zimmerman, in section 19-; J. Ingraham, 

 section 9; the heirs of Jacob Lawrence, in section 2, and by several 

 others. In all of these the coal varies little from three feet six inches, 

 and is of very good quality. The sandstone above the coal contains 

 numerous impressions of Lepidode'iidron and Sigillaria. 



Coal No. 7 was nowhere observed. Coal No. 76 was frequently seen on 

 top of the Irish Ridge, having a thickness of about ten inches, and 

 lying a few feet below the Crinoidal limestone. 



Adams Township contains several thin coals, rarely workable. Nos. 7, 

 7a, and 76 are frequently seen, but rarely exceed a foot in thickness. In 

 the south-western portion a coal between two and three feet thick, con- 

 taining some cannel, and lying forty-five feet below No. 76, is worked by 

 Messrs. Kerr, Gallagher & Wiley. 



