BURR: MELAPHYR OF BROOKLINE, BRIGHTON, AND NEWTON. 63 
For a mile west of the reservoir the slate seems to be quite lacking. It 
next occurs in a limited exposure on Beacon Street, a half-mile east of 
Newton Centre (Plate 2, Loc. 20). Here again there is strong evi- 
Figure l. Section A A’. 
dence of overthrustiug. The conglomerate cuts diagonally across the 
slate beds, and its under surface is deeply scored in the direction of the 
thrust. The relations here differ from those at Chestnut Hill. The 
slate dips north at a very low angle, while the overlying conglomerate 
has a much steeper dip (Figure 2). This relation is not suggestive of 
synclinal structure in the slate. If a syncline was developed in the 
eastward extension, it is safe to say that it did not extend to this point. 
Farther west the slate belt, if it exists, is covered beneath the glacial 
Figure 2. Section B B’. 
deposits of Newton. It seems extremely probable that it does underlie 
a portion of the low land extending along the line of Beacon Street. It 
appears again on the east side of the Charles River. Outcrops of slate 
and conglomerate occur near Chestnut Street, north of Newton Upper 
Falls, and a considerable outcrop of slate has recently been exposed east 
of Newton Lower Falls, near Waban Avenue (Plate 2, Loc. 23). In 
all exposures the slate is contorted and crushed, indicating that it has 
undergone something of the strains experienced by the rocks farther 
toward the east. At Newton Lower Falls a ditch has disclosed fine 
Ficure 3. Section CC’. 
conglomerate (Fig. 3), such as is frequently found immediately beneath 
the slates. This seems to indicate that the fault was dying out toward 
the west, the throw not being sufficient to bring up the lower members 
of the conglomerate series. It is evident that the fault fades out in like 
