SUPPLEMENTAL REPORT — HANGING ROCK DISTRICT. 891 



greatest 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 Liok, Franklin and 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 Coil Measures. It may be described as 

 an inlra-conglomerate limestone. The main body of the conglomerate, the 

 Waverly conglomerate of Prof. Andrews, lies below it, but in the £outh- 

 ern part of the district, it is also overlain in some instances hy 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 Siate, 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. Prom the north line 

 of Hooking county, as far southward as the middle of Jackson county, 

 its outcrop need scarcely be lost sight of for a mile. Though seen but 

 infrequently 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 it 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, it is 

 almost everywhere known as the Blw, Limestme, 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 ten inches. 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 doss not endure the weather well. For 

 these reasons, it has comparatively little value as a building stone. 



