364 STRATIGRAPHICAL GEOLOGY. 



and the materials are afforded for an understanding of the structure of 

 the rocks in Hanover and Lebanon. 



The Huronian rocks range through Hartford soutli of White river, and 

 then pass through the north-east corner of Hartland, before crossing the 

 Connecticut into New Hampshire. They are mostly hard, green diorites. 

 Along White river the strata are nearly vertical, — both diorites and dark 

 hornblendic varieties. About a mile below the junction there is a rail- 

 road cut through the hard greenstones. Towards the agricultural society 

 grounds the yellowish-green hard schists are vertical, with the course N. 

 13° E. The formation extends to the school-house No. 14 at the cross- 

 roads. In the south-east corner of Hartford the ledges are mostly con- 

 cealed by sand. At the falls. North Hartland, the hard green schists 

 form an island. A mile north they dip 85° N. 70° E. 



The Huronian, in crossing the Connecticut below Ouechee falls, has 

 left several high ledges resembling the piers of a bridge. Seams dipping 

 85° westerly traverse them, and are believed to represent the stratifica- 

 tion both of the diorites and the adjacent hornblende schist. The Huro- 

 nian schists now leave the river, and form the foundations of Willard's 

 ledge. Numerous embossed ledges of greenstone show themselves over 

 this hill as far as Beaver brook ; the dips are a little north of west. Newer 

 rocks and alluvium conceal the Huronian schists to the south of Beaver 

 brook. There is evidence of the presence of these underlying ledges 

 about a mile north of the Windsor bridge, in the production of a westerly 

 dip and an anticlinal in the calciferous schists. Dingleton hill must have 

 these greenstones within it, since they crop out in a single ledge along 

 Section V, at its southern end. 



The rocks supposed to underlie Dingleton hill appear again in the 

 ridge south of Walker's brook, in the north-west part of Claremont. 

 The country between has not been explored. At the school-house No. 

 19 there are hard, green sandstones, dipping S. 30° W. This reaches 

 for a mile or more, when the valley of Sugar river intervenes, occupied 

 by Calciferous mica schist. The continuation of the Huronian is to be 

 seen in Barber's mountain, in the angle of a large curve in Connecticut 

 river. The near proximity of the Ascutncy granite suggests a reason 

 why the bosses in the north-west part of the town should be thrust out 

 so far east of the continuation of Barber's mountain. The summit of this 



