GEOLOGY CF THE MERRIMACK DISTRICT. 495 



common gneiss on the west and the porphyritic on the east. In Sullivan 

 and Cheshire counties it seems sometimes to verge into the White Moun- 

 tain gneisses. In the south-east part of Landaff the rocks that we have 

 referred to in this group appear, but here they have more the character of 

 mica schist than gneiss. In general they are thin-bedded, and split with an 

 even cleavage into comparatively thin plates. Garnets are quite common, 

 and we find a few coarse granitic veins. The band, as a whole, seems to 

 have a synclinal structure ; and on the west we have hornblende schists 

 and common gneisses, and on the east ferruginous schists. The great 

 ridge running southward towards the summit of Moosilauke, between Tun- 

 nel brook and the great ravine west, is composed of a rock very similar to 

 that in Landaff; though, as we approach the summit of the mountain, the 

 rock has more the character of a micaceous gneiss. The old bridle path 

 from North Benton follows the ridge, and in many places there are 

 ledges, the outcrops being more numerous than on any of the other 

 approaches to the mountains. The whole width of the band, measured 

 across Moosilauke, is not far from one mile and four fifths. This is not 

 directly across the strata, since between the east and west summits the 

 strike corresponds in places very nearly with the ridge. On the west 

 spur of the mountain we find the rock not very unlike that on the east, 

 except that the cleavage planes are not so numerous, and the rock 

 appears to be thick-bedded and contains fibrolite. The mountain has 

 a synclinal structure, and the relations of the rocks to those on either 

 side are shown in Section VIII. The south-west side of Moosilauke is 

 largely covered with drift, and the micaceous gneiss and schist extend 

 nearly to N. Merrill's. As far as Warren is concerned, the fibrolite rocks 

 are found along the entire eastern border of the town. They can be seen 

 on the ridge east of R. K. Clement's, and there are many outcrops along 

 Mt. Carr. On Hurricane brook, about a mile and a quarter above R. F. 

 Clifford's, they succeed the common gneiss, and occupy the whole moun- 

 tain east. The rock here is almost massive, and is composed mainly of 

 quartz, mica, and fibrolite. On the ridge of Mt. Carr we begin to meet 

 with those great coarse granite veins so common along the entire outcrop 

 of this formation southward. Although the fibrolite rock has a high east- 

 erly dip on Mt. Carr, as we go eastward it becomes more nearly vertical, 

 and in Ellsworth the dip is generally westerly. It extends to Ellsworth 



