1875.1 411 [Dodge. 



* 



blasted away in the last year or two for a space covering whole 

 squares. 



North-east of a line from here to Savin Hill, the conglomerate dis- 

 appears. It probably underlies South Boston, however, and there 

 was, in fact, a quarry of " slate " near " Nook's Hill" in the western 

 part of the peninsula, while this was still a pasture two centuries 

 ago. The land has been so raised from its former low level at the 

 place, that I have not found any traces of outcrop there, and ascer- 

 tained the fact from other sources. The " road to the Nuke " ran 

 from Dorchester. Street at Seventh Street, northerly to the corner of 

 Fourth and E Streets, then north-westerly, and west of this angle was 

 " quarry meadow." There is a sunken ledge off the north side of 

 South Boston. 



South of the crystallines of Newton and Brookline, the conglom- 

 erates are very extensive and prominently placed. The picturesque 

 country produced by such rocks has been well treated in laying out 

 private grounds in the northern part of West Roxbury, and the most 

 magnificent opportunities still remain in that town and in Brookline. 



In the vicinity of the southern part of Newton the conglomerate 

 is not so hard and compact as, for instance, in the Washington Street 

 quarries in Roxbury. It crumbles easily, owing partly to the rusting 

 out of numerous grains of magnetic iron. 



The high conglomerate masses between slate band (b) and the 

 Neponset River, seem to continue the line of uplift of the Dedham 

 range of crystallines. Across the river there are extensive conglom- 

 erates in Milton, and westward in Hyde Park and West Roxbury, 

 which probably belong wholly or in part to this group. 



The chief peculiarity of the South Shore conglomerates is the close 

 relation in which they are involved with the crystallines or eruptives 

 in Hingham, Cohasset and Nantasket. They seem to be interlocked 

 in incomprehensible confusion on Planter's Hill, and eastward to the 

 sea. The strike is preserved, however, as appears in the islands in 

 Hingham Harbor and continuing ledges at Downer's Landing. The 

 pudding-stone approaches the slate at Hewitt's Cove, and excavations 

 may show their relations at that place. 



The probability is very strong that most of the conglomerates of 

 this vicinity are more recent than most of the slates. And in view of 

 the facts that there are Carboniferous strata in New Brunswick ad- 

 joining Paradoxides slates, and that at Newport the Carboniferous 

 conglomerates, which occupy apparently the same position as our 



