BURR: MELAPHYR OF BROOKLINE, BRIGHTON, AND NEWTON. 59 
Figure 2). The cutting and distorting of the bedding planes is strik- 
ingly shown. | 
The third exposure is intermediate between, but considerably south 
of, the other two. The melaphyr mass is here not more than fifteen feet 
thick, and is bordered by slate on both sides. The slate on the northern 
or upper side lies in patches on the melaphyr. Here, again, a zone of 
baking is developed along the contact, while the cutting of the slate 
by the melaphyr is quite as conspicuous as it is in the other two 
localities. 
The two melaphyr bodies occurring next to the north make up a sin- 
gle ridge, or rather a succession of melaphyr knobs. Slate appears in a 
number of places on these knobs. These patches of slate are connected, 
on Mr. Woodward’s map, to form a parting between the two supposed 
flows. A narrow, wedge-shaped mass of slate occurs at Locality 26 
(Plate 2), west of Webster Street. The melaphyr just below this slate 
contains fragments of it. On the contact, the influence of the igneous 
mass is apparent. The slate is broken by very many small faults. These 
do not pass into the melaphyr, the line of contact between the slate and 
the igneous rock being quite continuous. It is probable that these faults 
were produced by disturbance attendant upon the intrusion of the igneous 
rock, the effect being obliterated along the contact by the influence of 
the molten mass. <A second exposure of slate occurs on this line on the 
west side of Webster Place. The evidence here is not so striking, but is 
quite as good as in the other places. A third locality appears, on Wood- 
ward’s map, on Cambridge Street, behind the Convent (Plate 2, Loc. 18). 
This outcrop shows, in the most conclusive manner, the extremely com- 
plicated way in which the melaphyr has been forced into the sediments. 
In fact, the whole outcrop is practically a breccia of great slate and sand- 
stone blocks, held in a matrix of melaphyr, which fills all the cracks and 
penetrates the sediment in thousands of tongues. The sandstone blocks 
themselves are shattered so that they have the appearance of a fault 
breccia and these small displacements do not pass across the contact into 
the igneous rock. 
Another portion of this mass is shown in contact with slate and sand- 
stone on Cambridge Street, opposite Saunders Street (Plate 2, Loc. 17). 
Recent blasting at this point makes it possible to obtain very fine hand 
specimens, showing the intricate way in which the melaphyr has pene- 
trated the sediment. The fifth and sixth “flows” do not appear in con- 
tact with overlying sediments. 
No other contact exposures are known, excepting several in the Allston 
