999 



outcrops of slate and granite there is thus a gap of fully one 

 fourth of a mile, and concerning the exact position and the 

 character of the contact we know simply nothing. 



The stratigraphic continuity of the section from the granite 

 north of Beal Street across the melaphyr and the conglomerate 

 series to Beal's Cove is unrpiestionable , and, although the 

 relations of the Beal's Cove slate to the conglomerate series 

 are not so fully and clearly exposed as could be desired, the 

 perfect agreement m strike and dip and the indications of a 

 gradual transition afforded by the interstratification of sand- 

 stone and slate, appear to justify us, as already stated, in 

 regarding it as a part of the same conformable sequence of 

 strata. If, as this view requires, the slate conformably over- 

 lies the conglomerate series, Beal's Cove must mark the 

 position of a synclinal axis ; and, since the slate nuist, in this 

 case, be nuich newer than the granite, the south side of the 

 syncline is probably cut away by a fault with the downthrow to 

 the north, for there is evidently not room enough south of the 

 axis for a repetition of the conglomerate series and melaphyr. 

 Between the granite north of Beal Street, which still holds its 

 normal relation to the bedded rocks deposited upon it, and the 

 granite against which they end, as the result of f^iulting, on 

 the south, we have, then, a steep monocline (one half of a 

 syncline) and, as previously stated, one complete section of 

 the Ilingham strata. 



Eastward from Beal's Cove and south of Tucker's Swamp, 

 there are, fortunately, sufficient outcrops to connect the section 

 just described with the ledges in the vicinity of Hockley Lane. 

 The single small outcrop of the true slate (14) east of the 

 cove is much nearer the water than represented, and evidently 

 below the hio-hest bed on the west side of the cove. About 

 1,000 feet east of the salt marsh bordering the northern arm 

 of the cove, and immediately beyond where the l)oun(lary of 

 Tucker's Swamp bends to the north, we come to a con- 

 siderable exposure of the newest conglomerate and sandstone 



