248 GEOLOGY OF OHIO. 
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Moisture ies 55a bor seae nesters veces Caw eee sa aS ee rennet 4.20 
Wolatile miatter: tc eeecccde. ie obese eeceoe ok acces eee ee ee: 37.01 
ELK Od, CAPD OM yes e eh cee eee doo he OL ot Oe een Ls NOES ee 51.64 
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Some of the coal produced is considerably better than these figures 
would indicate, but in all essential particulars the analysis is charac- 
teristic of the seam. ‘The ash is a little in excess of much of the output. 
Clay veins make but little trouble with the seam at this point. 
The chief irregularity consists in what are termed horsebacks, which are 
due in all cases to a descent of the sandstone roof, by which the 
shales are first cut away, and after them the coal more or less seriously. 
One of the last-named mines, viz., Empire No. 3, encountered a 
descent of the sandstone in recent workings, which extended for 60° 
yards, and which reduced the coal from 4 ft. 10 in. to 1 ft. 6 in., but 
the seam regained its full thickness beyond. This channel held a direction 
of S$. 15° E. Mr. Andrew Lee, Superintendent of the New York and 
Ohio Coal Company’s mines, has found this to be the general direction 
of the sandstone troughs wherever they occur in this part of the field. 
The coal of the Allen mine is one of the most regular and valuable 
bodies of the Dell Roy field. 
Around the village of Dell Roy the Upper Freeport seam has long 
been worked for local supply, and numerous drift entries still exist 
here. Just beyond the town, Russell and Wetzel have recently opened 
a small mine, in which the coal showed the following structure : 
FIGURE AY 
STRUCTURE OF DELL ROY COAL, RUSSELL BANK, 
Shales ov Sawdvock_____ : 
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Lirnestone 
