16. TOBOYNE TOWNSHIP. F 2 . 353 



nificant the thickness not exceeding an inch or two. Of 

 course it dipped almost vertically downward into the ground, 

 and being nearly in the bed of the creek, was soon under 

 water. However interesting geologically, it is of no value, 

 and it would be a mistake to imagine the Horse valley a coal 

 mining region. See chapter V on the Perry county coals. 



The Hudson Biver shales, JYb. Ill, b. 



Overlying the Utica shales already described are the Hud- 

 son river series, a thick mass of greenish and yellowish 

 shales cropping out on the slopes of the valley along the 

 Hanks of Tuscarora and Conecocheague. These beds con- 

 tain little that calls for special notice here. Near their 

 base, however, or perhaps in the upper layers of the Utica 

 shales occur two springs, yielding water strongly impreg- 

 nated with sulphureted hydrogen. The sulphur is de- 

 posited, after decomposition of the gas by contact with the 

 oxygen of the air, in a delicate film on whatever object hap- 

 pens to lie in the way. 



These shales continue southwestward through the valley 

 to its opening at Concord narrows into Path valley. 



In Burns valley the Medina sandstone appears to form 

 the line, and consequently every lower bed must lie in 

 Franklin county. But in two of the three small valleys at 

 the head of Amberson valley it is almost certain that the 

 Hudson River shales and perhaps even lower beds must crop 

 out. The cleavage of Bower mountain over the axis takes 

 place in Perry county, and if it had been practicable to ex- 

 amine the anticlinal valley there formed they would almost 

 certainly have been found. In representing them on the 

 county map I have followed probability rather than actual 

 observation, but it must be remembered that the map of 

 Madison, Jackson, and Toboyne townships is only a sketch, 

 the time available having proved too short to allow a 

 thorough exploration of this difficult ground without sacri- 

 ficing other objects of the survey. 



The Medina sandstone, No. IV. 



The Medina sandstone is the most conspicuous object in 

 23 P. 



