GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. 22/ 



the cast spur of Mt. Osceola, or some of the mountams not far behind it 

 in Elkins's Grant. The locahty on Redrock brook seems too remote for 

 their source. Many of these boulders have been collected by Mr. Conna- 

 ble, who has spent eighteen summers at his cottage near Greeley's, and 

 they are tastefully arranged about his grounds in rustic seats, and dis- 

 posed in piles so as to intensify the colors by the water falling from an 

 artificial fountain. 



5. Mt. Tom Area. 



Not far from New Zealand river there are ledges of a feldspathic rock, 

 consisting of orthoclase and quartz with a fine-grained base, weathering 

 nearly white. Several shades of this rock occur all the way from the 

 western base to near the summit of Mt. Tom, — some of it resembling 

 sandstone, — having a northerly dip. There is more of it on the east side, 

 about as far down as Mt. Andalusite. It joins the andalusite and similar 

 slates upon the east, that which is nearest the supposed porphyry being 

 indurated. Scarcely any observations of the dips have been preserved ; 

 but the general impression is, that the feldspathic rocks overlie the slates. 

 In passing north-easterly from Mt. Tom the slates are succeeded directly 

 by the Albany granite, without the intervention of the porphyries. 



I have found other ledges related to that on the west side, in ascend- 

 ing Mt. Field from the saddle between that and its eastern spur, and upon 

 the north shoulder of Mt. Field (p. 178). The Mt. Tom area is quite lim- 

 ited in its extent, and may be almost incorporated with the andalusite 

 slate group. 



6. Bartlett, Jackson, and Chatham. 



These are inconsiderable. The first is a small series of outcrops in 

 the valley of Rocky Branch, two miles above its mouth. It is grayish, 

 and was at first thought to be labradorite. The second is noticed upon 

 page 128, an area of two miles' extent upon the south-west side of Sable 

 mountain. If it occupies the limits suggested, as far south as Mountain 

 pond, the area would be four miles in diameter. Part of this rock is brec- 

 ciated, belonging to the later group. The porphyry in Chatham lies upon 

 a two-thousand feet mountain in the west part of the town, more than a 

 mile from the Jackson line. No facts have been preserved in regard to 

 the extent of this area, but it must be small. 



