coal. 349 



tne dip, southeast, a distance of betweeri I 1 * 1 ) and 500 feet, when a faull 

 with a northeast trend is said to have been encountered — probably one of 

 the branches of the Marshall fault system. 



The old Fox slope. Till- is located nil till- 1 1< Hi 1 II -;i St en I i -i >1 1 t'l 1 1( - of tlle 



Marshall field, and is sunk in a southeasterly direction al a gentle angle 

 through the overlying sandstones to the coal beneath, [ts output was once 

 important, but it has long been closed. Its coal is probably continuous 

 with that of the Fox mine, but hero shows considerable diminution in 

 thickness. 



The old Marshall slope. This, lying ill till- YITV Western part lit' till- field, 



was sunk across the strata, toward the west, the dip of the beds being 

 east. It evidently opened bul a small area of coal, which was directly 

 in the bow of tin- strata from their vertical position to that of gentle dip 



The Marshall No. 5. (Fig. 1. PI. XVIII.) Tllis i - tile lll|l\ lllille latelv 



worked on the upper coal bench of the Marshall field, that south of the 

 southern branch of the general faull system. It was opened in 1886 

 1>\ a horizontal drift beneath the coal, which cut the latter at a dis- 

 tance of about 240 feet from the entrance. The first cross-entry was 

 then turned on the strike, nearly parallel with the outcrop. The strike 

 is generally X. 60 E., the dip about 5 SSE. The coal at the breast 

 of the cross-entr) at the time of examination was ;i feet thick, a part- 

 ing of half an inch occurring i' feel from the top. At a distance oi 

 200 feet hack from the breast this parting began to increase perceptibly 

 in thickness; 100 feet farther on toward the main entrance it showed a 

 thickness of 1 foot, and in the next 50 feet became i feet thick. The 

 parting thus continued increasing to the turn of the entry, at which point 

 the upper coal was some little distance above the roof. A short distance 

 beneath the lower member, in the main entry, a 1-foot coal bed was 

 struck, which increases to 3 feel at the outcrop, several hundred yards west 

 of the No. .") mine. The coal of the No. 5 mine is very brighl and 

 resinous, contains a slight amount of pvrite. is of cubical structure, and 

 has a conchoidal fracture. The top coal is the harder and more fibrous, 

 ami in general resembles the upper division of the Fox coal. 



Tin- upper coal bench has been well prospected along it- outcrop by 



