507 
[Crosby; 
lS 9 2.j 
the conglomerate. This conglomerate is largely composed of 
the debris of the granite ; but, although newer than the granite, 
its relations to that rock indicate that it is probably the oldest 
conglomerate in the Hingham area, belonging in its normal posi- 
tion below the melaphyr. In the section accompanying the map 
of the Village area this basal CQnglomerate appears on the extreme 
right. Apart from this, the Village area is a long, narrow block 
of strata faulted down between walls of granite, the drop on the 
north being so much greater than that on the south as, in con- 
junction with a horizontal or plicating stress, to overturn the 
beds. Or it may be otherwise described as an inverted syncline 
deeply folded down in the granite and the northern half carried 
away by the fault which elevated the granitic axis on the north. 
THE BEAL’S COVE AREA. 
This area (PI. XV) has been already described as affording, 
between the granite on Beal Street and Beal’s Cove, the most 
complete and normal section of the Hingham strata. The west- 
ern extremity of the granite axis is well defined. The granite 
is overlain at this point, as already noted, by patches of effusive 
felsite, including the mass wrongly marked as an outlier of con- 
glomerate. One proof that not only this felsite but also that 
farther east, in the vicinity of Thaxter and Lincoln Streets, is 
part of a surface flow or truly effusive is found in the fact, that it 
occurs only near the junction of the granite and the bedded rocks, 
which, it is so very evident, were deposited upon the granite. Tn 
other words, we find the felsite upon what we know to have been 
the ancient surface of the granite, and wherever erosion has cut 
below this surface the effusive felsite is wholly wanting and we 
observe only narrow and irregular dikes of intrusive felsite. 
The unusual breadth of the melaphyr south of Beal Street is 
probably due to a strike fault, as indicated by the enclosed mass 
of conglomerate. The contact of the melaphyr and overlying 
conglomerate shows conclusively that the conglomerate was de- 
posited over the melaphyr and that the latter is effusive, prob- 
ably a submarine flow. Crossing the alternating beds of conglom- 
erate, sandstone, and slate southward, we come, on the north 
shore of Beal’s Cove, to evidences that the conglomerate series 
changes gradually and conformably iuto the great overlying slate 
