1040 -GEOLOGY OF OHIO. 
of thin streaks of coal distributed through 10 to 20 feet of clay and 
shale. Its maximum thickness, so far as observed, is 36 inches, the seam 
giving this measure in Section 14, Vernon township. Near Pine Grove 
Furnace also, a good thickness was observed, but it often runs down to 
6 or 8 inches. The coal is mined in such few instances, and in such a 
small and irregular way, that no judgment can be given as to its quality.. 
This appears to be the “slate vein” of Washington Furnace, the desig- 
nation being given on account of the black slate roof of the coal. Its 
structure is shown in the accompanying diagram : 
FIGURE ¢xXk 
SECTION OF ‘SLATE' CGAL AT WASH- 
INGTON FURNACE 
Black Slate _ Oe Daa|==|=S=s 
Efe paint ee AM BLN GS, = 
Fireselia jy bs. lagi ay ae pion ey og 
Banercoglinerul tangs ir isons 
Prime =e VON oe bitun ee e a 
There is no promise given by this seam in the district of large 
mines, but it will long yield small local supplies to farmers and furnace 
hands who can obtain a winter’s stock by benching or stripping in 
favorable locations. | 3 
In Kentucky, this seam becomes in certain areas a cannel of good 
quality. The Hunnewell and Chinn’s Creek cannels are referred to 
this horizon. 
The Brookville Coal, No. 4, of Newberry, No. 5, of Kentucky. 
A somewhat more important seam in this district than either of 
those already named is the Brookville coal. It has been described 
under two numbers in previous reports, viz., as No. 3c and as No. 4. 
There is but little doubt that it comes in upon the Putnam Hili lime- 
stone horizon; and that, therefore, the latter number belongs to it, It 
is known as the Conway coal in the neighborhood of Ironton, where it 
has been mined in a small way in years past. Its place is 50-70 feet 
below the Ferriferous limestone. It does not show as great a thickness. 
in this district as in Vinton county, so far as it has been observed, and 
