654 GEOLOGY OF OHIO. 
f 
Above the Zoar limestone, as given in the section, in places, two seams 
of coal are found, before reaching the coal next below the Great Vein. 
Two seams are also frequently found below the blue limestone, which 
again, at times, forms the roof of another important coal seam. I have 
not observed the outcrop of any of these coals in this neighborhocd, but 
the outcrops of four such coals are to be seen in the hills in the neigh- 
borhood of Maxville, and I have indicated their position in the section. 
Of the iron ores the upper one, which is found at an altitude varying 
from ninety to one hundred and fifteen feet above the Great Vein, and 
one called the gray ore, found at a distance of thirty-five to forty-five feet 
below the Great Vein, are the most important and the most valuable. | 
The first exhibits its best characteristics at Iron Point, north of Shaw- 
nee, where it reaches a maximum thickness of three feet, and appears to 
form a continuous stratum extending through the hill. It seems to have 
been originally a blue carbonate, now mainly changed in the outcrops to 
a sesquioxide. It. roasts very readily and yields a large percentage of 
iron, which is a httle cold short unless a mixture of other ores is used. 
Indications of its presence are to be seen near the top of almost every 
hill which reaches its horizon, and its outcrops have been observed in 
many places. It is the ore used in both of the furnaces at Shawnee, 
mixed with about one-sixth Lake Superior ore. The gray ore appears to 
be quite persistent, ranging in thickness generally from one to three 
feet, sometimes thinning down to a few inches, and in places disappear- 
ing altogether. It is the ore used in Mr. Baird’s Pioneer Furnace, west 
of Shawnee, and produces a good mill and foundry iron, without any ad- 
mixture of foreign ores. 
It is largely developed and of excellent quality in the hills about Old 
and New Straitsville, and in nearly all the hills which reach its proper. 
horizon, to the west line of Monday Creek township. Separated in a 
few places by shale intervening between it and coal No. 5, its ordinary 
position is directly beneath the fire-clay of this coal, and it is often as- 
sociated with a cherty drab limestone. When the ore is well developed 
it seems to take the place of the coal, the latter showing only a faint 
trace of carbonaceous matter. Where drifts have been carried into the 
hill, the ore has been found, on an average, nine feet below the coal, the 
interval being filled with fire-clay, and the ore resting on flint, limestone 
and sometimes in sand-rock. 
It is generally oxydized and contains a large percentage of sesquiox- 
ide. Although here called the gray ore from its color when not oxydized, 
may well bear the name of the “Baird ore” from the name of the pro- 
