GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. I /I 



little lower. On ascending the Silver cascade, the first thirty or forty 

 yards from the road consist of the hard granitic schists. Next follows 

 perhaps 300 feet thickness of Breccia granite rather more siliceous than 

 common, reaching to the top of the falls as shown in the heliotype, while 

 the same Montalban gneisses appear behind where the water has worn 

 through them. The color of the foreground represents the hard Mont- 

 alban schist ; the upper is the new variety of rock. The under slope 

 of the Breccia granite at the falls dips 60° S. 48° W. The gently dipping 

 planes, 15° S. 17° W., are in this rock. The harder variety does not seem 

 so well adapted to be permeated by them. The rocks above are noticed 

 on p. 123. From this point I have traced this granite along the hill-side 

 to the middle and upper parts of Mt. Webster. Between the cascade and 

 first outcrop of Conway granite the Montalban schists prevail, perhaps 

 a distance of sixty or eighty rods. 



I desire to present here a rough sketch of the appearance of the several 

 kinds of rocks on the east side of Mt. Willard, as seen from a short dis- 

 tance above the road at the falls on Silver cascade. It is given in Fig. 16. 

 The view extends from the south cliff of Mt. Willard, a little above the 

 north flume. On the left the limits of the Conway granite are defined. 

 The Montalban schists extend thence past both flumes down to the 

 James cut, beyond the limits of the figure. The cliff under the Butter- 

 wort flume is thought to be the brecciated part of the Montalban 

 schists, which attain here their highest elevation. To the left is a smooth 

 face of the Breccia granite, dipping gently northerly. Below, the bushes 

 and debris conceal the exposures as far down as the railroad. From a 

 point farther south on Mt. Webster the whole length of the Butterwort 

 flume is finely displayed. From the last point of the hard schists on the 

 carriage-road to the southern termination of the same schist on top of 

 Mt. Willard, the course is about N. 75° W. 



Flumes. During our examination of the upper part of Mt. Willard 

 two interesting flumes were discovered. Starting from the top and fol- 

 lowing round the edge of the cliff, we soon pass the junction of the 

 Conway granite with the hard Montalban gneisses. The first flume is 

 only a short distance beyond. It is not perceptible from the top of the 

 cliff. Its course is determined by a trap dyke dipping 65° S. 10° W., 

 about five feet wide. For about 200 feet the excavation into the moun- 



