W. O. Crosby—Pinite in Eastern Massachusetts. 119 
appearance, yields to the knife, and affords water abundantly. 
Su stantially the same statement may be repeated concerning 
all these cases the rock is reen, at least superficially. In Mar- 
pavers I have observed the brown, 
that, with few exceptions, those portions of the conglomerate 
(and the same is true of the reccia), marked by a predomi- 
remains to be adduced. 
: "he locality affording at once the clearest proof that the 
Pinite is indigenous in the petrosilex, that it makes its appear- 
ance in this association as a decomposition product, and that 
Pinite so originating is essentially identical with, and the source 
of, that in the more recent, detrital formations of Eastern Mas- 
