628 STRATIGRAPHICAL GEOLOGY. 



Farviington. At H. Lord's, dip 45° N. 60° W. 



At Mrs. B. Willey's, ferruginous, dip N. At Lebanon post-ofFice, several places, dip 



W. 50° W. 



At MerrilPs corner, dip 80° N. 40° W. At Baptist church, to the south, an anti- 



Milton. clinal. 



At south corner, dip 30° westerly. Acton, Me. 



At South Milton, dip 70° N. 30° W. Half a mile east of South Acton, dip ig° 



Lebanon, Me. N. W. 



At south corner, dip 50° N. 60° W. At Acton corner, dip 85° S. 50° E. 

 At C. D. Rankin's, dip 45° N. 60° W. 



There is not great opportunity afforded in this table for making out 

 many axes, otherwise than by inversion. The observation at Gonic would 

 afford an anticlinal with those farther north. This might agree with the 

 supposed inverted axis south of Rochester Junction. There is another 

 in Acton. The rocks have a fresher look than pertains to the Rocking- 

 ham schists, and perhaps this fact has led us to esteem the andalusite 

 group the newest, in the absence of the proper stratigraphical evidence. 

 The analogues of this group in other parts of the state are the Monad- 

 nock, Kearsarge, Ragged, Mt. Tom, Mt. Washington, and a few other 

 areas. They seem commonly to constitute elevations resting upon older 

 metamorphic formations. This last-described area is an exception to the 

 general rule, as none of it is much elevated. This Rochester area, if con- 

 tinued, might connect with the more argillaceous portions of the Merri- 

 mack group in Derry, Nashua, and so on into Massachusetts, to join the 

 celebrated made rock of Lancaster. 



7. HURONIAN AND CaMBRIAN. 



The rocks referred to these groups are in the Massachusetts portion of 

 the south-east sheet of the geological map. There are two areas. The 

 first is called "hornblende slate" upon the geological map of Massachu- 

 setts, and lies on the west border of the large extent of sienite of the 

 Newburyport district, being about eight miles long by two wide. The 

 second occupies the Parker River basin, and consists of three different 

 kinds of rocks, all of them unlike anything yet recognized in New Hamp- 

 shire. 



The hornblende schist resembles one of the members of the Huronian 

 in the Connecticut valley, seen repeatedly between Bernardston and 



