230 



greenish, .sometimes reddish or purplish, idjundantly and 

 rather coarsely aniygdaloidal in certain parts, with segregations 

 of cpidote and ferruginous silica, and in every essential 

 respect similar to that which we have followed all the way 

 around the granite from Portuguese Larie. The dip, so far as 

 can be judged by the flow structure — the sheets and layers 

 of aniygdules — is nearly horizontal. The occurrence of 

 felsite behind Mr. Bradley's barn, just west of Thaxter Street, 

 as already described, makes it necessary to curve the southern 

 boundary of the melaphyr to the north here. The last ex[)o8ure 

 of this melaphyr is in Thaxter Street, a few yards south of 

 Lincoln Street; l)ut it is assumed, in the absence of evidence 

 to the contrary, to form a continuous belt bordering the granite 

 as far east as the harbor. The melaphyr iu the angle east of 

 Unit's Cove Lane and north of Lincoln Street is of precisely 

 the same ciiaracter, except that it is, perhaps, more profusely 

 amygdaloidal ; and the layers of amygdules indicate very 

 plainly a gentle southerly dij), suggesting that the conglomerate 

 on Lincoln Street, l)etween Thaxter Street and the Lane, in 

 which the dip has not been made out, lies in a shallow 

 syncline, and tiiat the melaphyr is continuous beneath it. 

 This correlates the conglomerate with the great bed (3), 

 which we have elsewhere found lying directly u[)on the 

 melaphyr. It is the broad and open character of this fold, as 

 thus indicated, that has led me to extend the conglomerate 

 color so far beyond the observations. 



The large outcrop of melaphyr west of the junction of 

 Downer Avenue and Crow Point Lane is quite varied in 

 character. It is not conspicuously amygdaloidal, and the 

 lower and northern part of the mass, although somewhat 

 brecciated and containino- irregular, angular segregations of 

 bright red jasper, is mainly quite compact and massive. 

 Above, however, the melaphyr is very scoriaceous, with 

 numerous jaspery and e])idotic segregatit)ns and veinlets and 

 distinct indications of a true conglomerate with well-rounded 



