217 



the j^ninitc and the bedded roeks, which, it is so evident, were 

 deposited upon the granite. In other words, we find the 

 telsite upon what we know to have been the ancient surface of 

 the granite, from which tlie sedimentary deposits have recently 

 been denuded ; and wherever erosion has cut below this siu'tace 

 the efFusive felsite is wholly wanting and we observe only an 

 occasional narrow and irregular dike of intrusive felsite. 



Along the northwest side of the granite there is a line of 

 coniilonierate ledijjes sufficient to indicate a narrow but continu- 

 ous or nearly continuous band of conglomerate separating the 

 granite from the overlying melaphyr. This conglomerate 

 undoubtedly extends consideral)ly farther than it is marked, the 

 more northerly outcrops having escaped observation at the 

 time the ma[) was drawn. One of these is on the west side of 

 the winding road known as Hawke's Lane running south from 

 Lincoln Street to an isolated house ; and another, which will 

 be referred to later, is on the south side of Lincoln Street west 

 of the lane. This conglomerate is a true puddingstone, con- 

 sisting of rounded fragments of granite, felsite, and melaphyr ; 

 but the contact with the granite is not clearly exposed, and we 

 can only conjecture that the rehitions of the two rocks are, 

 perhaps, the same as south of Hockley Lane. This sup[)osed 

 basal conglomerate can not be traced around the extrcinity of 

 the granite axis, and the narrow belt of it marked along the 

 southern margin of the granite is imsupported by a single out- 

 crop, finding its justification simply in the depression between 

 the granite and melaphyr ; while the fact that outliers of 

 melaphyr rest upon the granite north of Beal Street is rather 

 against its existence. In the two sections accompanying the 

 map, it is omitted from the one extending south from Beal 

 Street to Beal's Cove ; although represented, as the facts 

 justify, in the other, running northwest from the granite. 



South of the granite, the main bed of melaphyr is well 

 exposed in two large groups of ledges. It is the typical green, 

 basic variety, and is abundantly but coarsely and irregularly 



