Se 
558 GEOLOGY OF OHIO. 
shown to be three feet thick, and so far from the surface that it may be 
profitably mined. The sandstone below it rests upon No. 6, and is thirty 
feet thick. 
On the hill west of Millersburg a patch of limestone may be seen near 
the horizon of this coal, which probably represents the buff limestone of 
No. 7, in the central and eastern parts of the State. The sandstone above 
this is the highest rock found in place in the county. 
IRON ORE AND FIRE CLAYS. 
Incidental mention has been made of these minerals in the previous 
pages of this report. The fire-clays observed are all plastic, of a thick- 
ness ranging from four to ten feet or more, and are found under nearly 
all the exposures of the coal. They are of good quality, and practically 
inexhaustible. : 
Very little drifting or digging, has been made anywhere to develop the 
character of the ore deposits. Accidental exposures are numerous, and. 
in some places very large quantities are found on the slopes and in the 
ravines. The following table of analyses of specimens taken from the 
surface in localities giving the best Promise of a large supply, will indi- 
cate their character: 
a 
Number. Ws 2. 3. 4. 3. 6. Cie 
Specific gravity ...--.-..-- 3.692 | 3.428 | 3298 | 3.296 | 3.371 3.692 | 2.796 
Wiaters ste soos BOSE A bets il Se eset Ls oe choy? |) IG 4s). 6.12 11.70 
Silicious matter ...-...--- 18.80 | 22.72 | 18.84 | 33.68 4.30 13.28 | 26.64 
Carbonate of iron.....-...- 36.96 47.48 55.36 32.29 20 59 5207 i lesee cae 
Sesquioxide of iron ...--. 23.13 15.18 13.53 18.44 53.04 25.40 56.75 
Oxide of manganese .....- 1.50 0.80 1.25 1.50 1.80 0.40 1.40 
7 MOTI peeing Be Ee aol aooversccl be dO) 0.90 1.00 0.30 0.10 1.40 
Phosphate of lime .-...... 0.97 6.55 1.53 0.32 trace. 0.06 1.46 
Carbonate of lime ........ 7.46 2 16 Qe 1.30 om 1) he in eens ya 
Carbonate of magnesia....| 2.12 1.74 5.14 1.59 1.36 0.64 0.75 
Sully hues ese eeisccvencto ns trace. 0.07 0.14 ONO ae leaChaACO. | anc wee le eeene eats 
Totals eset seis 99.83 | 99.33 | 99.41 | 99.63 | 99.95 | 99.26 |100.1 
Metallic iron ...........--| 34.03, | 3400 | 36.19 | 2850 | 47.42 | 42.91 | 39.73 
Phosphoric acid .-.--.--,-| 3.645 3.005 0.702 .| 0.15 | trace. | 0.03 0.67 
* Water and organic matter. 
No. 1. Under Motes’ coal, Knox township. 
No. 2. a ae Waverly. 
No. 2. Under Coal No. 2, Hardy township. 
No. 3. ef Knox of 
No. 4. Over Coal No. 3, Knox township, Simmons’s. 
No. 5. sf ot Hilison. 
No. 6. Iron ore seam, Washington township. 
