1881.] 
209 
[Dodge. 
clingstone ancl the slates at Bellevue Avenue and vicinity, above 
described, there is a half mile tract of country in which at pres- 
ent outcrops are wanting so far as I know. Further east the 
slates approach the conglomerates, and their relations can be 
studied. In the northern part of Mt. Hope Cemetery, near Sar- 
gent Street, there is slate dipping 72°-82° South. Sandy layers 
are occasionally contorted. The slate probably extends south- 
ward nearly to Walnut Avenue. There is a good deal 'of purl- 
clingstone near Auburn Avenue, ancl on the south side of Back 
Street there is a passage southward, slate to. conglomerate, about 
four hundred feet from the line of division between Mt. Hope 
and Calvary Cemeteries. Felsite is next found, in going south- 
ward. There are large quantities of puddingstone between Mes- 
senger ancl Jamaica Streets, crossing the latter street where it 
crosses Blue Hill Avenue ; the same rock occurs along the New 
York ancl New England railroad, half way from Forest Hills 
Avenue (now Morton Street) to Norfolk Street near Matta]3an 
station, and as far as the Norfolk Street crossing in the other 
direction ; also about Evans, Maxwell ancl Selden Streets. At 
the corner of Corbett ancl Norfolk Streets the conglomerate 
is near the slate again, that extensive mass of slate between Blue 
Hill Avenue ancl Dorchester station (N. Y. & N. E. R. R.), ex- 
posed along Madison Street, quarried on the south side of the 
hill, thence extending west of Pratt Street 300 yards to the north 
of Lauriat Street, cropping out in Chapman Avenue south of the 
Catholic Cemetery, and underlying the surface in the cemetery 
itself; where portions of the rock have been blasted out. The 
strike is about N. 55° E. — S. 55° W., and dip from vertical to 
70° S. E. Slate occurs again in Torrey Street near Washington. 
At the north corner of Dorchester ancl Welles Avenues, just north 
of extensive masses of puddingstone, the slate clips 75° South. 
The false bedding in the weathered edges here is unmistakable 
proof of the relative position of the strata. 
I do not know of a single fact tending to support the supposi- 
tion that the West Roxbury ancl Dorchester slates lie in a syncli- 
nal. I do not assert that they constitute an unbroken succession 
from north to south, but they are obviously of great thickness and 
I have not detected any evidence of repetition by faulting. 
PROCEEDINGS B. S. N. H. VOL. XXI. 14 JANUARY, 1882. 
