2.S9 



from the sandstone on the east to that on the west, is about 

 350 feet. The shite is somewhat variable in character ; being 

 mainly l)r<)wnisii or chocolate-colored near the upper and lower 

 borders, and gray or greenish gray, banded with dull red, in the 

 middle of the belt. It is, throughout, thin-bedded, banded or 

 shaly, and finely jointed. The dip is constantly to the west 

 and southwest, but inconstant in amount. The anjjle jjiven 

 on the map — 60° — is tlie highest observed, the normal varia- 

 tion being from 30° to 40''. 



The slate valley is bounded on the west by GO feet or more 

 of coarse gray sandstone, about 30 feet of brown slate, and 

 100 feet of sandstone ; and these beds can be traced south by 

 frequent outcrops to the end of Planter's Fields Lane. The 

 last sandstone is here overlain on the west by a bed of brown 

 slate, which can not be ti'aeed far to the north. Then comes 

 a heavy bed of conglomerate, which at the northern end is 

 actually exposed for a hundred feet in breadth and seems to 

 broaden southward, possil)ly enclosing, as the ma[) shows, 

 another bed of brown slate. At the extreme north this conglom- 

 erate is, apparently, overlain by still another bed of sandstone. 

 That all of these beds are cut off" on the south by the great 

 dike scarcely admits of doubt ; but whether we have reached 

 the end of the series toward the west, and how it terminates in 

 that direction, we can only conjecture, as there is an absolute 

 blank of about 400 feet between the last of the sedimentary 

 outcro{)s and the first appearance of the Huit's Cove mela- 

 phyr, except at the extreme northwest corner of the sedimentary 

 area. I am now satisfied that the small outcrops of sandstone 

 shown on the map near the border of the inelaphyr really are 

 melaphyr ; and the boundary line should be carried far enough 

 to the east to include them. The actual gap between the two 

 rocks at this point, measured across the strike, is probably 7iot 

 more than 150 feet. 



Although there are no reversed dips, a general view of this 

 series of strata suijffests that the main band of slate marks a 



