GEOLOGY OF THE COAST DISTRICT. 623 



In the east corner of Plaistow, quite near the railroad, is a large mass 

 of granite, thought at first to represent the porphyritic gneiss. At J. 

 Noyes's, a prominent set of joints clip 35° N. In the east part of Atkin- 

 son coarse granites abound at L. Darling's. Smaller beds are scattered 

 through Hampstead. The schists seen in a trip through the east part of 

 Plaistow and Hampstead were thought to be more like the Rockingham 

 than Merrimack. A fine-grained granite has been observed on the high- 

 est land on the west side of Country pond, at South Kingston, which is 

 probably continuous with a similar rock on a north-west ridge in East 

 Hampstead, visible for half a mile. The course of this mass would be 

 about east and west, not agreeing with the strike of the schists. In the 

 very west corner of South Kingston are large beds of coarse granite. 

 Kingston is mostly covered by sand, but there are indications of a schis- 

 tose ledge in the north-east corner of the town. There are a few out- 

 crops of unclean ferruginous schist near Mrs. Morrill's, in the south-east 

 corner of East Kingston. Almost the only ledge found in South Hamp- 

 ton occurs on a hummock close by the west line of the town. It is a 

 gray quartzite, breaking into innumerable pieces in consequence of ex- 

 posure to frost. In Seabrook there is more variety. North of the vil- 

 lage ferruginous quartz and flinty slates are interstratified, traversed by 

 a peculiar porphyritic diorite. Other trap dykes occur at the village, and 

 at a school-house east of the railroad. Half a mile west of Seabrook vil- 

 lage there is a granite mass. At a Baptist church in Hampton Falls the 

 rock is a gray sandstone, easily mistaken for sienite at a little distance. 

 Two miles north the slates are friable and decompose easily. Trap 

 occurs at the school-house east of Wolf hill, and north of Little Boar's 

 Head, in Hampton. 



About Portsmouth the ledges are well displayed. There seems to be 

 a synclinal axis from the south end of the town through to the north end 

 of Newcastle. The anticlinal on the north is very near to it. Bands of 

 gneiss or indigenous granite are quite conspicuous in this and the adjoin- 

 ing towns. One of the most prominent is Breakfast hill, perhaps an anti- 

 clinal. This band crops out north-easterly at the railroad crossing in the 

 extreme south part of the town, near J. Marston's, T. Lightfoot's, and north 

 of Sagamore creek, on the Telegraph road. It also appears just north 

 of the same creek on the road to Frost's point from Portsmouth, on a 



