102 STRATIGRAPHICAL GEOLOGY. 



The next locality where this rock has been observed as the continua- 

 tion of the Bald Mountain locality is on the northern peak of Mt. Kins- 

 man, An unknown space of about three miles between them has not 

 been traversed at all by any of our parties, but is supposed to be occupied 

 by the same formation. The strata on the Kinsman ridge, a mile north 

 of the summit, dip 50° N. 20° W., and, at a cascade low down the west 

 side, near its western border, they incline 50° N. 32° W. The rock has 

 also been observed by our parties upon the summit of Mt. Kinsman. To 

 the south of Kinsman the formation must contract in width, perhaps 

 passing beneath the northern point of Woodstock, and expanding in the 

 central part of Woodstock wider than is known elsewhere in this range. 

 At the mouth of Moosilauke brook at North Woodstock the dip is 70° S. 

 37° E. A quarter of a mile farther north the position is essentially the 

 same. Upon Section VIII several specimens of this formation have 

 been collected, proving its occurrence to the west line of Woodstock, 

 and it probably dips beneath Moosilauke to come up again in Benton 

 on the other side of the andalusite mica schist. The outcrops along 

 the section, in connection with a limited area in Wentworth (Specimen 

 No. 121 1), constitute all the evidence we have in regard to the existence 

 of a narrow range of this porphyritic rock west of the main range, unless 

 it be in Sullivan county, much farther south. Along the west side of 

 the Pemigewasset valley in Woodstock the porphyritic gneiss constitutes 

 high, bald cliffs. At the post office or central village the dip is 85° S. 

 57° E. Half a mile east of Elbow pond a rough gneiss, much contorted, 

 dips about 80° S. 32° E. South of J. Downing's in Woodstock a coarse 

 gneiss dips very high S. ^y° E. There is a similar rock dipping 75° N. 

 37° W. at the outlet of Hubbard pond, thus indicating the presence of an 

 anticlinal axis in the south part of Woodstock. In Thornton this rock 

 appears south of Hatch hill, near R. Tompkinson's, also at a saw-mill a 

 quarter of a mile to the south, and at J. Oilman's, where it is traversed 

 by veins of very coarse granite. Many other exposures occur along the 

 valley through Thornton, crossing the river so as to connect with the 

 most southern ledge known of this sort in the very edge of Campton. 

 Our observations in this valley were mostly made before we understood 

 the true character of the rock. Being regarded as granite, no pains were 

 then taken to observe lines of stratification in it which doubtless exist. 



