916 GEOLOGY OF OHIO. 
Logan. Here itshowsquitea heavy blossom in the road near M. Keigley’s 
house. 
This seam is the exact counterpart of the true No. IV, underlying the — 
southern Gray Limestone just as Coal No. IV underlies the northern Gray 
Limestone. The name assigned to it in the scale is Coal No. IVa. 
8. Itis tu be noted that the part of the series which we have now 
reached is, by far, the most crowded of the Lower Coal Measures. The 
barren intervals are here greatly reduced, and a rise of more than twenty 
feet is s:ldom required in order to reach a new horizon of coal or ore. 
The four last named seams belong to this crowded series, as do the four 
that follow. 
In regard to the numbers of the coals that follow, no responsibility is 
here assumed. The Upper New Lexington Coal has been pronounced by 
the geologists who have worked in that district as No. VI of Dr. Newberry’s 
classification, and the Lower New Lexington Coal has been made No. V of 
the same scheme. A connection is claimed to have been made between 
the Upper New lexington coal and the Straitsville seam. That connec- 
tion is not called in question, but in numbering the coals that follow 
No. V, No. VI, etc., no reference is made to the eastern extensions of these 
numbers; but in speaking of No. VI the Straitsville or Nelsonville seam 
is referred to, and No. V is applied to the first general seam below it. 
With this qualification, then, it may be added that Coal No. V is the 
seam next met. Its position is about ten feet above the limestone or 
Baird ore af the northward, and about twenty to twenty-five feet above 
the same horizon, south of Vinton county. In working the Baird ore 
the place of the coal is almost always shown. Another seam is frequently 
found from ten to fifteen feet above it, which is often confounded with it. 
Both are shown on Washington Furnace lands and at many points in 
Vinton county in thesame hills. The lower of the two is the main seam. 
It is cilled the New Castle Coal in Lawrence county, where it yields a 
large amount of fuel, being extensively worked in the vicinity of Iron- 
ton. It is here acoal of fair quality, but not adapted to iron manufae- 
ture. Coal No. V is not worked elsewhere in the district to any extent. 
At Nelsonville it holds a thickness of between two and three feet, and, as 
tradition says, was the first coal ever opened there. It is at present go 
entirely overshadowed by the great coal seam above it—No. VI—+that its 
presence is quite lost sight of. It may be added that it is a remarkably 
constant geological feature of the whole field. It is scarcely necessary to 
lose sight of it between Perry county and the Obio River. 
9. The coal that comes next in order is, by far, the most impor tant of 
Ohio coals, viz., No. VI, of Newberry’ s classification. It is found at a 
