SUPPLEMENTAL REPORT—HANGING ROCK DISTRICT. 891 
ereatest measures found are one hundred and thirty-five feet in two in- 
stances in Hocking county. 
With the clue above named, the horizon of the Maxville Limestone. 
can apparently be followed in patches of gray or drab, sometimes, blue- 
ish limestones, generally sandy in composition, from the south line of 
Vinton county, through the townships of Lick, Franklinavd ._Hamilton, 
of Jackson county, and through Harrison and townships, Scioto county, 
to the Ohio River. In other words, the Maxville Limestone constitutes 
a definite horizon in the Lower Coal Measures. It may be described as 
an tntra-conglomerate limestone. The main body of the conglomerate, the 
Waverly conglomerate of Prof. Andrews, lies below it, but in the couth- 
ern part of the district, it is also overlain in some instances by twenty 
or thirty feet of conglomerate. 
Like all the other Coal Measure limestones, this ore is occasionally re- 
placed by flint. | 
2. The Zoar Limestone.—This stratum takes its designation from the 
village of that name in Tuscarawas county, where it was first studied in 
its relations to the Ohio series. It is beyond question the best marked 
stratum in the Lower Coal Measures of the S'ate, and, therefore, the 
most available guide in establishing the order of this varied series of 
deposits. It can be followed without interruption from the Pennsyl- 
vania line, through Mahoning county, Stark, Holmes, Tuscarawas, 
Coshocton, Muskingum, and Perry, to Hocking. From the north line 
of Hocking county, as far southward as the middlg of Jackson county, 
its outcrop need scarcely ba lost sight of for a mile. Though seen but 
infrequsntly from that point to the Ohio River, there is no uncertainty 
or obscurity as to its place in the series. Before it disappears, it has 
established connections with a group of strata that is everywhere de- 
veloped and exposed in the furnace districts beyond. The lowest of 
these block ores that constitute so important a reliance of the western 
furnaces, rests upon the Zoar Limestone when it is present, and repre- 
sents if when it is absent. 
The color of the limestone is dark-blue, as indicated by the name,that 
it usually bears. Along the line of its outcrop through the State, is is 
almost everywhere known as the B!we Limestone, the only exception be- 
ing that it is occasionally styled the Black Limestone. In thickness it 
occasionally rises to ten feet, but it, as often, shrinks to teninches. The 
usual measure for it in this district is from one to three feet. It is gen- 
erally shaly in structure, at least for a part of the stratum. It does not 
lie in massive or even beds, and does not endure the weather well. For 
these reasons, it has comparatively little value as a building stone. 
