GEOLOGY OF THE COAST DISTRICT. 619 



Sotnersworth. Rollinsford. 



Near Smith & Roberts's, dip southerly. At S. Hale's, dip 65° N. 70° W. 



At Great Falls academy, dip 70° N. 30° 

 W. 



Of the several axes indicated in this list, perhaps the most important is 

 the continuation of the anticlinal from the Hampstead gneiss through 

 Sandown, Fremont, and Epping into Nottingham. This seems to con- 

 nect the different gneisses together, placing the Nashua and Raymond 

 schists in a separate stratigraphical district from those of Epping, Dan- 

 ville, etc. Through Fremont and Epping we get evidences of a well- 

 marked synclinal, perhaps terminating in Nottingham. Through Fre- 

 mont and Brentwood this is a natural basin between ridges of gneiss. 



Between the Raymond and Epping sides of the anticlinal are marked 

 differences in lithological composition. In the former area is a rock 

 much like the typical Huronian, with its dolomites. They occupy a con- 

 siderable space in Raymond, characterized by an almost east and west 

 strike. Similar ledges have been noticed in the north part of Derry, 

 north of Beaver pond (pp. 581,582). There is a related rock more than 

 a mile wide in the south-east part of Auburn, which seems like the 

 natural continuation of the Raymond belt. On the Epping side nearly 

 all the exposures consist of gray micaceous quartzite and mica schist, not 

 different from the common variety of the Merrimack group. The mica 

 schists on the Raymond side are coarser and less siliceous. Perhaps this 

 axial line ought to be employed on the map as the boundary between the 

 Rockingham and Merrimack group. 



A few facts of interest respecting the rocks over this area are the fol- 

 lowing: In Auburn, north of the Devil's Den, at J. Calef's and R Pres- 

 ton's, the schists are cut at an angle of eighty degrees by a vein of 

 granite. East of the den are many large white beds of granite. The 

 den itself seems to be a knob of mica schist. The south part of Auburn 

 is largely occupied by drift, and the most easterly outcrop of Lake gneiss 

 is by D. Ball's, perhaps an outlier. I do not find mention made of bedded 

 granites in the west part of Chester. The quartz bands have a large 

 development, being nearly continuous from a mile south of Raymond vil- 

 lage to Nottingham square. This principal band crosses the railroad east 

 of Raymond village, and there is a smaller one about a mile west of the 



