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 an 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. 7b was observed at only one locality. It is worked by 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 
PMC rinodslaimestone ts see Se ta Ree ae Aen eee eyae eet aca etc meys Q)  & 
ee) cee NS Se Ce IR ee ARN Pe oles eso cene er wi litoy A) 
See 1G Oa aetete cee tis ae ie NEB ive eee een he Fe ae) gs emt ree bam egies en ee Ql 
Dl UB TAGC kes ll AVG oer ib 5 ocd erento eyave Fev eacttc ete Sater ary oan Rey cece nie ae rE 0 6 
GC COA Le Me ON NPR ET SUE OR aM Lee Se BRBEEN Pers idan Role aura PASO sh 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 Lepidodendron and Sigillaria. 
Coal No. 7 was nowhere observed. Coal No. 7b 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 7b 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. 7b, is worked by 
Messrs. Kerr, Gallagher & Wiley. 
