200 



TRANSACTIONS OF THE 



A series of dark argillaceous shales and limestone shales 

 intervenes between the conglomerates and the blue tran- 

 sition limestones of the valley, all which preserve a 

 general inclination of about 45° degrees to the south. 

 Another series of dark shales separates this limestone 

 from the numerous beds of sandstones and conglomerates 

 of Path mountain and the contiguous elevated region 

 called the Seven mountains. Here the strata assume a 

 highly inclined position, forming an angle of 70 or 80°, 

 and even in several instances approach to verticality. 



Organic Remains. 



These are not numerous. In the red sandstones of 

 Jack's mountain are some beds containing an undescribed 

 fucoides. Amongst detrital fragments apparently wash- 

 ed out of the gorge, some white sandstones exhibit 

 Fucoides Alleghaniensis. Near the foot of Path moun- 

 tain are beds of the obscurely developed Fucoides figured 

 by me in a former article. Trans. G. S., pi. 2, fig. 3. 

 In the white gritty sandstone of the same mountain 

 occur FucQides Alleghaniensis and some others — and a 

 few producta are distributed among the same rocks. 

 Amongst the dark shale beds, at the north foot of Jack's 

 mountain, are seams of from one to four inches in thick- 

 ness, composed almost wholly of crinoidal (pentacrinital) 

 remains. These chiefly consist of detached joints, 

 which are not more than from the one-twentieth to the 

 one-thirtieth part of an inch in diameter. Occasionally 

 columns of eight or ten joints occur, and the whole are 

 commonly much decomposed. The limestone seems to 

 be almost destitute of fossils. 



Minerals, 



Hydrates of iron, chiefly in the form of rich pipe ore, 

 occur in this valley contiguous to the limestone. 

 Haemetites also exist in the same situations. Another 



