GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 427 



the concretionary veins of quartz between the lamina; of the schist. On 

 the general section, there is a change in the dip of the strata. If this 

 exists in reality, the band next to the river is probably slate and not Cal- 

 ciferous mica schist. This would not be improbable, since the rocks on 

 the opposite side of the river are Huronian. The Calciferous mica schist, 

 both in Rockingham, Vt, and on the Connecticut below South Charles- 

 town, presents a monoclinal structure ; and we have a narrow band of Huro- 

 nian rock between, while in their present inverted position the Montalban 

 rocks rest upon the Calciferous ; and these relations are shown in Fig. 65. 

 In Alstead, east of the gneiss at Paper Mill Village, there is a band of 

 Calciferous mica schist. It extends up Warren brook above the road to 

 Alstead Centre, and up Cold river into the edge of Langdon. The rock 

 consists of a decomposing mica schist and a bluish siliceous limestone; 

 and everywhere the rock appears the strata are nearly horizontal. 



The third area is in the extreme western part of Westmoreland. At a 

 spring by the side of the road, near Daniel Burnham's, there is a siliceous 

 limestone interstratified with argillaceous schist. The strata are nearly 

 vertical, but have an easterly dip opposite the quartzite and schist in the 

 north-west corner of Chesterfield. At A. B. Cole's we have slate with- 

 out the limestone. This band as a whole resembles very much the rocks 

 along the river in Brattleboro' and those immediately opposite in Dum- 

 merston. The following dips were observed: 



At grist-mill west of H. Hall's, S. 85° E. East of grist-mill, Alstead, nearly horizon- 



50°. tal. 



At South Charlestown, S. 75° E. 60°. At Farmer's foundry, W. 10°. 



At railroad a mile north of South Charles- At D. Burnham's, Westmoreland, N. 50° 



town, N. 70° W. 65°. E. 70°. 



Eruptive Rocks. 



The absence of eruptive rocks in this area is quite noticeable, as there 

 are very few compared with those found in other parts of the state. The 

 boulders of trap that occur may have come a long distance, since the boul- 

 der of serpentine seen in Keene must have come from Vermont, and some 

 of them have travelled twenty-five or thirty miles. The only eruptive rock 

 of any extent that is found is in Westmoreland, and forms most of the hill 

 south-east of the railroad station in the west part of the town. The railroad 



