382 G. W. Hawes—Albany Granite and its Contact Phenomena. 
spot adjoins the schist has the granophyre* structure. This 
structure may therefore be induced as a contact phenomenon. 
Ascending Mt. Kearsarge by the bridle path from the 
Intervale station, the base of the mountain is seen to be 
composed of Conway granite.t At a height of 500 feet one 
e as one o 
porphyry, Ha gradually changes and finally becomes typical 
Albany gra ere again we see that the Conway 
granite was a gen body influencing the crystallization of 
a later eruption. After climbing for a short while over 
the Albany granite, the zone of porphyry again appears ; then 
follows in proper sequence the mixed zone, but this zone 
which upon Mt. Willard attains to a width of twenty feet, here 
forms the whole grand mass of Kearsarge, Bartlett and ‘Moat 
Mountains. These mountains from base to summit consist of 
angular pieces of schists intermingled with and cemented by 
granite porphyry. The schists have been modified by the 
0) bh 
cemented by a small amount of the granite, which has been 
accordingly much modified by the effect of the schist, and has 
a ground mass very fine in texture, and homogeneous and 
flinty in appearance. Above, where there is a smaller propor- 
tion of schist in the porphyry, this ground-mass becomes more 
coarsely crystalline, and approaches granite in texture. The 
micrascopic peculiarities however remain constant and the 
large zircon crystals never fail. 
I have endeavored to show that the contact phenomena con- 
nected with the Albany granite are very beautifully developed 
upon a small scale, affording thus exceptional facilities for 
study and observation ; but that on the other hand they reach 
an unequalled grandeur of proportion. The evidence previ- 
ously offered by others has not been decisive in determining 
the eruptive or mokamonghis oacih of this rock, and I point to 
the fact that many other important granitic masses have been 
referred to the one or the other of these groups upon the same 
insufficient evidences of structure and internal stratification. 
rom observations incidental to this work I am, however, quite 
certain that the stu 20 of the contact phenomena of the other 
great granitic ma n New Hampshire would develop as 
many interesting “Hithological facts, rite furnish the proper 
evidence for a determination of their orig 
* Used in the sense of cpg That is, the quartz and congad of the 
ground mass are arranged-with reference to one another, as in graphic granite. 
Wiss alas huis ty ths purl ou Ne w Hampshire Geology, Hitchcock. 
