/ 
HOCKING VALLEY COAL FIELD. 981 
it has been demonstrated that the Carbondale coal is in reality the Nel- 
sonville seam, reduced to somewhat smaller proportions and somewhat 
deteriorated in quality, but still maintaining the divisions and general 
characteristics of the more favored portions. The structure of the Car- 
bondale coal is shown in the appended figure. By examination of the 
diagram, it will be seen that the main change from the Nelsonville 
phase consists in the reduction of the lower bench, which is compensated 
in part by an unusual thickness of the midde bench, bringing the 
ageregate thickness of the two lower benches up to the normal measure. 
The upper bench of coal carries the soft coal as usual directly above 
the second slate, and only a thin piece remains to be split out before 
the top of the original Middle Kittanning seam is reached. The Hock- 
ing Valley supplementary seam here degenerates into a black slate with 
‘ streaks of coal, a vast amount of fossil wood being carried in its lower 
portion. In passing over the Hocking Valley field from Sunday Creek 
to Carbondale, the middle bench is seen to have been increased from 
4 to 30 inches, or to even more. 
FLGURE CxXY WL 
STRUCTURE OF CARBONDALE COAL AT MINES, 
Black Slate with streaks ———————— 
coal. False Roo 
(Gre ya tl Ue AIG) Nek NE ONL RR 
Coalinsone sos a: SNR 
Coal Ay AA NANT a yao bade A a Monten A AN 
Y Tise-cloy Pa A PEP IEE TEY TINY Aut AY Wee 05s ix 
The composition of the coal, as sampled by Mr. C. N. Brown, 
and analyzed by Professor Lord, is shown herewith: 
Composition of Carbondale Coal (Lord.) 
IWIGTIE IO BRD) coos baptooco boob CHUCOnuG CONCGEEOESECC SHAE SEE HEE CC RE GEe ICH SE ar ea panama eT aaa 5.05 
Wolatilercombustiblenmatter) ccer caer ccc co cns cece deccets occbcesedcoccuccecocesesl as 38.55 
EX CORCATIO OMe es eee eee ro nia ca esioie cogs beedSane-s Sones nosso avelvccdoeieteacceesssees 49.62 
NET a spp OCB BS UE HIDODEGB 0000050000 CORRE REECE TEE CECE EERE RE CREE not cee EEE Ee enre 6.78 
FG £2) eee eee eee ee eee ocean began Maia sie cate le, 100.00 
