252 



This slate is not that which we have pi-cviously observed 

 underlying the conglomerate ; f"or on ascending the slo[)e north 

 of the fault it is found, as shown on the map, to rest upon the 

 conglomerate, which has been shifted laterally a little more than 

 its own breadth, equivalent to a vertical slip of nearly 200 feet. 

 From this point the conglomerate can be traced across the fields 

 in frequent outcrops, approximately as mapped, for nearly a 

 quarter of a mile, closely bordered by the outcrops of slate on 

 the west and of melaphyr on the east, the termination of the 

 conglomerate being marked by a large bowlder of coarse con- 

 glomerate resting upon a ledge of melaphyr. We look in vain 

 here for any trace of the slate which we have found along the 

 eastern shore of the cove separating the melaphyr and con- 

 glomerate. Apparently, the throw of the transverse fault, 

 added to the strike-fault bounding the melaphyr, has been 

 sufficient to conceal the lower slate ; and we thus reach the 

 conclusion that, as shown on the new map, the transverse fault 

 probably breaks but does not necessarily cross the strike-fault. 

 The transverse fault marked as crossing the conglomerate 

 northeast of the cove is clearly indicated by the jogging of both 

 the upper and lower contacts of the conglomerate ; and the 

 change of strike on crossing this line is obvious. At the point 

 where the conglomerate is mapped as coming to an abrupt 

 termination it evidently shares the fate of the lower slate. A 

 transverse fault is almost a necessity here ; and its relations to 

 the strike-fault and the strata are the same as before. The 

 contact between the conglomerate and melaphyr is exposed at 

 several points, but not sufficiently to reveal clearly their true 

 relations. The contact is, apparently, an irregular surface and 

 is broken by minor faults as well as by the principal displace- 

 ments already described. 



Undoubtedly the best section of the slate series of Hingham 

 is that along the north side of Huit's Cove. From the 

 conglomerate west across the strike the slate is exposed 

 almost continuously for about 1,100 feet. The dip is 



