Crosby.J 
504 
[May iS 
ably extend east under Broad Cove and Otis Hill ; and the 
monocline can be clearly traced still farther in the three sedi- 
mentary islands of Hingham Harbor and in the ledges of 
Melville Garden. Westward from the Garden, however, this 
monocline of east-west strike and southerly dip changes grad- 
ually but rapidly to a north-south strike and westerly dip, plung- 
ing down against the great mass of melaphyr already described. 
It is obvious from this sketch of the stratigraphy that, while 
folds of various types are the dominant form of displacement and 
give character to the area, the flexures are profoundly modified 
by longitudinal and transverse faults. The correct interpreta- 
tion of these main structure lines is evidently essential to the de- 
termination of the stratigraphic elements or the normal succession 
of the strata. Of the four sections accompanying the maps, three 
are approximately complete, viz: (1) the section south of the 
granite axis, through the Village (PI. XIV) ; (2) the section 
from Beal Street to Beal’s Cove (PI. XV) ; and (3) the section 
from Melville Garden west toward Huit’s Cove (PI. XVI). They 
agree in their main features, and especially in showing repeated 
alternations of coarse and fine sediments. But a more careful 
comparison re\^eals the fact that they cannot be exactly cor- 
related or synchronized ; and we are obliged to recognize even in 
this limited area, important lateral changes in the character or 
thickness of individual strata, sand stoneat one point being 
represented by conglomerate or shale at another, and so on. The 
following table of the strata of Hingham is compiled from the first 
and second sections referred to above. The individual beds are 
subject to constant variations in thickness ; and since the outcrops 
are unfavorable to exact measurement, the numbers are simply 
more or less satisfactory approximations. Some of the beds 
attain the maximum thickness in the one section and some in the 
other, and hence the totals do not correspond to the actual 
sections. 
