144 STRATIGRAPIIICAL GEOLOGY. 



dip ten degrees northerly. The fourth moiintahi (No. 5 of Fig. 32, Vol. 

 I) is distinctly composed of the Albany variety, the crystals of feldspar 

 being very numerous. I think the jointed planes dip in the same direc- 

 tion with those farther north. The high mountain to the south of Mt. 

 Hale is composed of the same material, and we do not know that it ex- 

 tends farther in that direction. The line connecting these several peaks 

 makes the arc of a circle, and the supposed position of the granites along 

 this curve appears in Fig. 13. 



In travelling from the third Sugar Loaf transversely across to Mt. 

 Tom, the rock is chiefly the Albany granite. The ledges are at the east 

 side of this third peak, on a west branch of New Zealand river as well as 

 at the stream itself. The granite range north of Mt. Tom shows a pre- 

 cipitous cliff on the west side. This has six summits north of Mt. Tom, 

 of which the first and second are nearly porphyritic, being compact, with 

 scattered crystals of orthoclase in it. On the third summit the rock is 

 easily referable to the Conway. That from the fourth contains much 

 quartz. In the fifth the feldspar has very much of a crystalline arrange- 

 ment. From the Sugar Loaves the Conway granite is continuous, by 

 way of the lower falls on the Ammonoosuc and the several peaks just 

 mentioned, to the Notch. On the east slope of Tom it descends quite 

 low, and finally crops out on Cascade brook. The precise connection 

 between this point and the same kind of granite on the Saco, deep down 

 below Mt. Willard, will be spoken of presently. Both the lower granites 

 are made out clearly on the east side of Mt. Tom. 



A second visit to the first part of this granite ridge north of Mt. Tom 

 showed that there was a long, low summit composed of the Albany gran- 

 ite, with jointed planes dipping about five degrees north-easterly. On 

 descending the mountain on the east side, this spotted rock was found to 

 be about three hundred feet thick, succeeded by the Conway variety, 

 which was followed down nearly the whole of the slope. On another 

 occasion we found the Albany granite occupying the saddle between 

 Mts. Tom and Field, as well as nearly all the space northerly to the 

 summit of the first named. Between this point, near the summit of 

 Tom, and the mountain north the country is composed of andalusite 

 slates, perhaps of the Coos group. Evidently there have been great 

 dislocations here. 



