GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 38 1 



Orford ; and, second, Acorn hill in Lyme, — the first more difficult to un- 

 derstand than the Piermont Peaked hill. West of Piermont village there 

 is a hard argillite, dipping 20° N., adjacent to Huronian protogene. On 

 the road to Haverhill, the Coos rocks come in contact with the Huronian, 

 likewise, in connection with a fault. The protogene dips 60° S. 20° E.; 

 while close by the mica schists dip 70° S., the common position being to 

 N. 50° W. The line of the fault, as mentioned upon page 359, is about 

 N. 25° E. 



There is a hilly country, not at all inhabited, between Eastman's brook 

 and Catamount hill, concerning whose geology nothing is known. While 

 the probabilities are in favor of its being, as represented upon the map, 

 the continuation of the mica schists, it may be granitic, or gneissic, or 

 hornblendic. Such a composition as the granitic would better agree with 

 the lack of inhabitants, the presumption being that the poverty of the 

 soil occasions the absence of farms. The west part of Fig. 49 is included 

 in the description of the rocks along Eastman's brook. To the east of 

 Peaked hill the line of this section leaves the river and passes directly 

 to Piermont mountain. On that there are mica schists, dipping 50° and 

 55° N. 54° W., also 80° N. 40° W. These are supposed to continue uni- 

 formly to the quartzite. Near the Christian church on Bean brook, a 

 little south of this section, we have a dip of 85° S. 32° E., which would 

 seem to indicate the place of a fold in the strata. 



The hills in the south part of Piermont remind one of the character- 

 istic domes of the limestone region. They are very high, rounded, with 

 deep valleys between them, while good farms occur universally. Start- 

 ing south-easterly from Piermont village for Indian pond, we find the fol- 

 lowing facts: At the village the dip is N. 50° W.; on top of the first hill, 

 the continuation of the Peaked Hill range, the mica schists are slightly 

 stauroliferous, dipping N. 60° W., with a small overturn anticlinal, the 

 steepest pitch being upon the south-east side. Whether this small fold 

 is local or not, I cannot say. The north-west dips occupy the south-east 

 side of the range. Beyond Bean brook there is a higher hill, with mica 

 schist dipping 8o°-85° N. 70° W. Just in the edge of Orford the schists 

 are pyritiferous. 



These rocks in the north part of Orford are represented in Fig. 50, a 

 section from Pine hill to the Soapstone mountain. On Pine hill are the 



