934 GEOLOGY OF OHIO. 
The portions represented by Nos. 2 and 3 ought both to go for- 
ward to market. No. 4 is rejected because of the extra amount of slack 
that it produces. ) 
There is a thin layer of coal at the top of the rider seam that is 
known to be good, but it is notgpracticable to separate it from the rest 
of the bench. Analysis No. 1 stands for the average of the 3 feet of 
the seam. Under present conditions, it is excluded from market by 
reason of the ash that it carries, but this is its sole drawback. It is 
low enough in sulphur to answer fora furnace fuel. The time will 
surely come when coal of this character will be gladly taken in Ohio, of 
course, as second class fuel. It costs more trouble to burn it, but it 
contains a large and available stock of heat that the Commonwealth 
can ill afford to lose. 
No better place will be found in which to trace the process by 
which the Middle Kittanning coal of the northern counties, with its 
remarkable steadiness of volume and composition, holding a thickness 
of less than 4 feet through county after county, becomes, all at once, 
the great coal of the Hocking Valley, ranging from 8 to 14 feet in 
thickness. ; 
In Figure LX XIX, page 888, the structure of the seam is shown 
at Sheerhan’s bank, near Moxahala, a short distance before it passes 
under the dividing ridge that marks the northern limit of Sunday Creek 
water. It is as follows: | 
Bone coal—U pper bench, rejected ............... ESNet WOR Ren ee aie 22 inches. 
Halse roof—Secondyslaterccccsq-cocoshscoccsenssscnesscsceees 2-4 i 
Top coal—Middlenbench sescckss eecsec coun ae eee ee ae (B10 at 
Tetra payee Mubd15 (VENKSY ancucedanb06000 000090000000000 40060005 900065000000 1 * 
Bottom! coal—Wower Denche..cccsccnesesencst coerce eeeteerceeeen es 26 ¥ 
The type section of the Sunday Creek coal, as shown at Corning 
and Rendville, is represented in Figure XCa, and consists of the follow- 
ing elements, viz. : 
Rid ensseamcncssesnsenccsncssosscmsatocscecscset: Mav eceuueeeaceaslesncasisecsoceeree 30 inches. 
Third slate wesc ec assetuscccscsstvocesetes cccscosesenccnsacsecotcccnues 4 ie 
Upper bench. | pene coal ieaincnce, 0 i ennai Aone 
SECON SIAC’. \iiccsee ce eecssesetteeesecsenserenececen stn vesnmewesioc 2 y 
Middle bench eon. ls ese ieiacacssiecasessecinse cosccsveuasen seeamecc acre cctes ee 1A) 3 
Hirst slate eee au carats tee ovovaled eee atleawaan carnenecaan pene enens Be ys 
Low er DENEH oe ee ee RM ides DEN LENO lace neat te 30 § 
