233 



at least three-fourths of a mile across the strike, i.e., to a 

 point one-fourth mile north of the Forest Hills escarpment ; 

 equivalent to fully thirty-five hundred feet of unfaulted beds. 

 Beyond the line indicated the inclination probably diminishes 

 gradually, but it is a region unfavorable for accurate observa- 

 tion. 



In the woods north of Williams Street, and east of Forest 

 Hills Street, the dip is not less than twenty-five degrees to 

 the south. In the high conglomerate masses on either side of 

 Glen Road there are obscure indications of a southerly dip of 

 fifteen degrees. On Walnut Street, between Gleri Road and 

 School Street, the dip is about the same ; and the conglomerate 

 is extremely coarse. South of Seaver Street the dip is, per- 

 haps, as low as ten degrees ; but it is still southerly. About 

 midway between the Boylston Street and Jamaica Plain Sta- 

 tions on the Boston and Providence Railroad the inclination 

 appears to be zero ; but north of this, between Spring Park 

 Avenue and Boylston Street, the beds are still inclined percep- 

 tibly to the south. Beyond this there seems to be, as already 

 stated, a broad band of nearly level strata. As indicated on 

 the map, the anticlinical is undoubtedly narrower toward the 

 east, and in this direction the crest is reached at a shorter dis- 

 tance from the southern border. On the line of the New York 

 and New England Railroad, from south to north, the following 

 dips have been observed : at Mt. Bowdoin Station, a high but 

 uncertain angle to the south ; at Wales Place, midway between 

 Green and Quincy Streets, S. 20°-25° ; in the vicinity of Bird 

 Street Station, S. 5°— 10° ; and between this point and Dudley 

 Street, the beds are horizontal or nearly so. About Meeting- 

 House Hill there is a perceptible southerly dip. I have not 

 been able to make out any reliable indications of bedding in the 

 conglomerate at Savin Hill, but it is probably about horizontal. 

 The rock is here very neatly divided by veins of quartz running 

 both with and across the strike, following the master-joints. 

 The only exposure of conglomerate north of Savin Hill is on 

 Dorchester Avenue, south of Mt. Vernon Street, where a great 



