588 STRATIGRAPHICAL GEOLOGY. 



of the other folds in the range is wanting. There is one correspondence 

 between the Kearsarge and Rockingham schists : both contain prominent 

 feldspathic or granitic beds near their borders, perhaps their lower mem- 

 bers. The former have not yet shown extensive bands of quartz, but 

 mention should be made of the small lenticular veins of rose quartz, 

 common both on Kearsarge and Ragged mountains. Large portions of 

 the ledges are thoroughly packed with andalusite. The crystals are 

 smaller than on Monadnock, or the east side of Mt. Washington, but are 

 well defined in certain localities, — sufficiently so to render probable the 

 reference of all the elongated prisms to the mineral andalusite rather than 

 fibrolite. The Kearsarge area is more sandy than the Monadnock, or 

 especially the Mt. Washington, which carries a great deal of argillaceous 

 matter. All these areas enumerated are believed to be of the same age, 

 and are so colored on the general map. Possibly the Kearsarge area may 

 reach into Franklin. I have not been able to traverse the road over the 

 continuation of this ridge in the west part of that town. 



8. Merrimack Group. 



I have not attempted to separate from the Rockingham series a narrow 

 band of Merrimack schists in Nashua and Derry. A few facts in refer- 

 ence to them have been already stated. There remain to be noticed a 

 few areas of rock, easily referred either to the Merrimack or Rockingham 

 series, mostly of a ferruginous character, between Francestown and Can- 

 terbury, The range is of importance, because it carries the soapstone 

 beds occurring in these two towns. The distribution of this rock indi- 

 cates its presence in three separate areas, — Canterbury, Boscawen, and 

 between Henniker and Greenfield, Except for a broad alluvial covering, 

 these three areas would not appear isolated upon the map. 



There is not a predominance of quartzite in these rocks. Ferruginous 

 and mica schists, with feldspathic beds, constitute the prevailing strata. 

 The first have lost their original appearance, by the decomposition of the 

 ferruginous mineral, and might perhaps be called pyritiferous quartzites, 

 before disintegration. The soapstone of Canterbury is supposed to lie 

 in this rock. It is about a mile and a half south of the station. There 

 seem to be two beds of the stone, one hundred feet apart, separated by 

 hard hornblcndic masses, and each about twenty-five feet wide. On the 



