19. WATTS TOWNSHIP. 



F. 385 



general report on the county, can be followed across the 

 Juniata into Watts township. It is in all probability a con- 

 tinuation of what is there named the East Duncannon dyke, 

 which passes through the cove and across Peters mountain 

 near the gap. It may be seen exposed by the riverside 

 about half a mile below Duncannon. Its course if con- 

 tinued along the same line would bring it nearly to the place 

 in Watts township where the trap-rock again appears, about 

 half a mile north of Dr. Reutter's house at the junction. 

 This dyke must therefore cut somewhere near Duncannon the 

 branch of the West Duncannon dyke which runs southeast 

 from its point of division. It is precisely like the trap of 

 Penn township — a hard, tough, dark green, almost black 

 dolerite, containing a small proportion of magnetic oxide of 

 iron which by rusting renders the outside yellow. From the 

 point where it first shows itself in the river bank it may be 

 tracked by loose blocks scattered on the roads and fields 

 nearly to the foot of Half Falls mountain and probably had 

 time allowed might have been followed farther. The last 

 trace of it seen was near the house of Mr. M. Peters. 



25 F a 



