Dodge.] 
208 
[May 18, 
into the slate quarries on the west side of Morton Street, seven 
hundred feet from Scarborough, where the strata have a southward 
dip varying from 60° to 85°. Conglomerate succeeds to this slate, 
occurring at the south-west corner of Canterbury and Morton 
Streets and in the south-eastern part of Forest Hills Cemetery. 
There are few outcrops in the mile westward from the cemetery. 
Mr. Crosby has described the puddingstone at Florence Street. 
Dorchester and West Doxbury Slates. West and south-west of 
Koslindale station (Boston and Providence Railroad) many new 
streets have been laid out, and the region is shown to be widely 
underlaid by slate. The rock appears on both sides of South Street, 
north-west from the station, and on W alter Street north of South. 
It occurs 500 feet north of South Street, an eighth of a mile west 
of Bellevue Avenue ; along Bellevue Avenue between South Street 
and the railroad (dipping south 65° or 70° with strike nearly 
east and west) 1 ; on the west side of Bellevue Avenue half- 
way between the railroad and Brook Avenue, a fine exposure 
seventy-five feet across, strike N. 55° E. — S. 55° W.) ; south of 
Brook Avenue (strike N. 70° E — S. 70° W.); east of Dudley Ave- 
nue ; on Linden Street, and Birch Street. In many or most of 
these places false bedding makes obvious the true dip of the beds. 
They cannot be assumed to be inverted to favor a theory as to 
their position. The same is true of the slates on each side of the 
track near the WestRoxbury station. Strike N. 78° E. — S. 78° 
W. Dip 83° to 86° southerly. At this point the slates are 
within quarter of a mile of the granite. It is seen 485 feet south 
of Spring Street station ; at the corner of Martin and Lagrange 
Streets; Beech and Washington Streets. Clarendon Hills cover 
portions of the puddingstone belt which crosses the Boston and 
Providence railroad half a mile south of Mt. Hope station, and is 
found along the west side of Poplar Street as far as Metropolitan 
Avenue, and south-west of Beech Street. South of the corner of 
Farrington Avenue the puddingstone is associated with (over- 
lies) the granite, as described by Mr. Crosby. Between this pud- 
1 In my 1875 paper the Bellevue Avenue bridge slates were placed nearly half a 
mile further west owing to a confusion from the use of insufficient maps. There are 
no outcrops at the Central Station. 
