Kiazer.] "'^^ (Apiil 2fi, 



to account for l)Ctls of such depth as those \vc fiiul Id tlie New Red, we may 

 nevertheh-ss consider tlie etlect of the waves in forming strata of sediment 

 in the shalh)w portions adjacent to the coast (which here seems to have 

 l)een tlie Soutii Mountain). 



The direction of the line of Section 7, Report for 1875 C C (wliich 

 corresponds with the South Mountain portion of the Section of tlie same 

 number in Roger's final Report) was chosen, after an examination of the 

 plotted work in that region permitted a mean of all the mountain dips to 

 l)e tixken. Tiie direction of this mean dip was chosen as the direction of 

 the section line because it was the line most nearly corresponding with all 

 the observed dips. A direction perpendicular to this will therefore re- 

 present with the nearest approach to exactness the strike of the old Hu- 

 ronian rock. 



These mean dip and strike lines are constant for the entire portion of the 

 South Mountain here under consideration. 

 This strike is E. 270N. 



The strike of the New Red Sandstone rocks contiguous to the above IIu- 

 rouian rocks was calculated in the same way, for Section Ga (the nearest 

 Section) and is E. 40ON. 



These lines thus intersect each other at an angle of IS'^. 

 If we assume that all the New Red Sandstone rocks Avhich cover a strip 

 of coMitry from 10 to 12 kilometers (G^ to 1^ miles) from the base of the 

 South Mountain were parts of the shallow or littoral ^resozoic sea, and there- 

 fore especially subjected to the wasting action of the waves ; it is natural 

 that the ore belt of the new forming rocks must follow approximately the 

 ore line below, and since only in a limited margin l)eyond the actual breadth 

 of the parent bed is it likely that the ore would show in the new forma- 

 tion, it might appear as if deposited in a vein more or less clearly defined, 

 and following a course of about E. 27° N. It should be here emphasized that 

 this might be so independentlj' of the accuracy or error of the wave-strew- 

 ing hypothesis, and independently of whether their present dips were ac- 

 quired then or subsequently; provided only that the new rocks were form- 

 ing on, and from the old. But whether or not this be the case, the follow- 

 ing phenomena are interesting. 



The mines known as the Dillsburg Group lie too close together to enable 

 one to predicate anything with confidence from them alone as to the di- 

 rection of the one or more belts of ore in which they are sunk, but if we 

 connect together the three northeivsternmost ore properties menticmed in 

 General Map C C 1875. (Meyer's. Ellicker'sand Kimmel's) with the group 

 around Franklintown, the line is very nearly E. 25^" N. /. e. that of the 

 above mentioned strike of the Huronian measures. Moreover there does 

 seem to be a certain conformability of the Dillsburg and other groups to 

 this line. [N. B. — The strike of sandstone 60 ft. down in the Altland 

 bank group is about E. 30° N. — nearly the same.] 



It chances that the average dip of the South Mountain rocks remain:* 

 pretty uniform from N. E. to S. AV., so that if there were any foundation 



