720 REGINALD ALDWORTH DALY 
ing no attention to planes of weakness. They are finer-grained 
than their parent sill, but show here and there a feldspar as much 
as two inches in length. 
One of the most interesting parts of the contacts is that 
which belongs to the area marked ‘‘ Lake Winnipiseogee gneiss”’ 
by the survey in the towns of Antrim and Hillsboro. It is 
exceptionally well exposed at intervals for a distance of five 
miles, and especially on the long ridge some two miles west of 
Antrim. The name thus given the rock with which the porphy- 
ritic granite here comes in contact is a decided misnomer. The 
new terrane consists of an ancient metamorphosed eruptive cut- 
ting the ‘“‘Ferruginous” rocks in every way similar to the schists 
that extend from Bennington to Henniker. This complex is 
itself cut by the porphyritic granite. 
The older eruptive rock is a typical coarse granitite containing 
a good deal of muscovite which is all secondary. The quartz is 
the common blue variety of New Hampshire crystallines. Both 
orthoclase and a basic plagioclase occur, but they are generally 
badly decomposed. It is a difficult rock to diagnose thoroughly 
on account of the vast amount of crushing which appears in the 
thin section. The quartz and feldspars ge much granulated 
marginally, the unbroken cores showing the characteristic wavy 
extinction. The plagioclase lamellae are often bent through 
large angles. Minute faulting is common in them, and through- 
out the slides the shreds of biotite are bent and twisted in a 
striking manner, while the extinction on the base of biotite 
plates is most irregular. In fact the condition of this rock is in 
marked contrast with that of the porphyritic granite close by. 
The granite is quite without any signs of serious disturbance; the 
granitite has endured the very severe mechanical strain of 
extensive mountain-building. Often the signs of developed 
schistosity in this once massive rock are easy to discern in the 
ledges, and these new structure planes strike a few degrees east 
of north, z.e., they lie in the main parallel to the strike of the 
 Fenrucimous e tetrante: 
Now, within the crushed granitite there is an extraordinary 
