SUPPLEMENTAL REPORT—HANGING ROCK DISTRICT. 901 
tion as the Logan Lime and Ore. Through Vinton and Jackson counties 
there are many showings of ore at this horizon, but none of them are 
known to be worked. : 
3. The next ore found in ascending the scale is of somewhat more 1m- 
portance. Its place is forty or fifty feet above the Logan flint. It rests 
upon the Maxville Limestone when this is present, and gets its name 
from this association, being known in the northern part of the district 
as the Maxville Block Ore. The ore often retains its place when the 
limestone is wanting, The same thing can be observed in repeated in- 
stances in the other ores that are associated with limestones in the dis- 
trict, the ore seams being generally more persistent than the limestones. 
An exception to this statement must be made in the case of some of 
the outcrops of this limestone in Vinton and Jackson counties. At Reed’s 
Mills, near Hamden Junction, there is quite an exposure of the Maxville 
horizon, but the ore seen at this point is thin and worthless. Of the 
numerous outcrops of the limestone in Lick and Franklin townships, 
Jackson county, none has been found to hold the ore, but it appears 
again in Hamilton township, where it has been worked to a smal! extent. 
In Monday Creek township, Perry county, and the adjoining township 
of Falls, in Hocking county, the Maxville Limestone is now quite ex- 
tensively worked for furnace flux. The Logan fire-clay, one of the most 
valuable clay seams of Ohio, is also obtained from the same horizon, its 
place being immediately above the ore and limestone. A considerable 
quantity of ore is raised with the fire-clay and the limestone, according- 
ly, in this vicinity. In quite a number of instances, the ore alone is 
worked, the overlying clay being below the standard quality, and the 
limestone being wanting. The Sciotoville and Webster fire-clays, of 
Scioto county, probably belong to the same horizon. 
In the vicinity of Logan, the Maxville Block Ore varies in thickness 
from an inch toa foot. It will probably average eight inches in the quarries 
that are most largely worked. It often lies in two courses, the heavier be- 
ing the lower. It is a dark-colored |imonite ore, of medium weight, and 
of good composition, yielding about forty per cent. of iron in the furnace. 
4. Passing, at sixty-five to eighty-five feet above the Maxville Lime- 
stone, an horizon of ore, fire-clay and coal—none of which are worked, 
we come at an elevation above the same limestone of" eighty-five to one 
hundred and fifteen feet,.to a block ore of excellent quality, and quite 
extensive distribution: A good deal of it was taken out for Union Fur- 
nace in Starr township, Hocking county, and it is accordingly named in 
the section, the Union Furnace Block or Lower Main Block. It has also 
been worked to the east and north of Logan to quite an extent. It 
