298 P. REPORT OF PROGRESS. E. W. CLAYPOLE. 



but judge it not to exceed 6 or 8 feet. Its bearing is, as 

 nearly as I could ascertain it, south 10° west. 



(3.) The West Duncannon dyke. 



Half way between the head of the cove and the river, and 

 near the foot of Peters' mountain, a range of trap can be 

 readily traced. It crosses Cove creek close by an old saw- 

 mill pond, now dry, and then shows in a byway on the 

 north side of the main turnpike road. Following it over a 

 field it is seen very plainly in the bank, and then runs along 

 keeping parallel with the same road as far as the foot of the 

 Cove mountain. 



In front of the farm-house which stands at this point is a 

 well sunk exactly on the line of the dyke. Mr. J. M. 

 White, who sank this well, informed me that he passed 

 through the dyke, and that it is not vertical, but pitches to 

 the w^est, at an angle of about 45°. The greater part of the 

 well was sunk in the red shale, the dyke being left at a 

 depth of about 8 feet. It measures here only about 6 or 8 

 feet, and consists of a number of loose blocks embedded in 

 the red clay — the product of their own decomposition. 



In the neighboring field a pit was dug to examine the dyke 

 which gave the same results. 



Crossing the road at this point the dyke can be traced 

 about 100 yards further through the orchard into the wood 

 where all traces of it are lost, nor has any one, to my knowl- 

 edge, ever seen it higher on the hill. 



(4..) The East Duncannon dyke. 



About three quarters of a mile further east a trap-dyke may 

 be seen in the roadside about J mile south of the mouth of 

 Sherman's creek. Thence it has been traced up the hillside, 

 where its outcrop lias been followed, in a vain search for 

 iron ore, to the top, but not to the crest of the mountain. 

 Tin- dyke euts through it near the brow overlooking the 

 river. 



It continues on the same course, S. 80° W., down the 

 slop.* of Peters 1 mountain into the cove, and maybe fol- 





