412 TOSEPH H. PERRY 



occupy every conceivable position, while the rock between, sev- 

 eral feet in thickness, is not broken, is not even folded. Why 

 the rock yielded so completely through these zones with so little 

 disturbance to the intervening rock is difificult to understand. 

 Near the border of the large phyllite mass the fragments sepa- 

 rated somewhat, and the unsolidified porphyry flowed in and 

 crystallized, making the border into a porphyry-breccia. Some 

 of this is well exposed at the side of the trail on the south slope, 

 and is shown in the illustration. 



In addition to the phyllite, there are, inclosed in the quartz- 

 porphyry, fragments of gray quartzite, of glassy quartz, and of 

 quartz-porphyry. The quartz-porphyry in fragments closely 

 resembles, frequently, the quartz-porphyry inclosing them. 



In Moat mountain the quartz-porphyry contains a smaller 

 number of fragments. Among these are those of glassy quartz, 

 of rusty mica-schist, of quartz-mica-schist, of quartz-porphyry, 

 of quartzite, of biotite-gneiss, of muscovite-granite, and of a 

 dark gray, rusty rock, probably a basic eruptive. In addition to 

 these small fragments, there is a large mass of phyllite, identical 

 with the Kearsarge phyllite and completely brecciated, making 

 up a large part of the top of Moat. The fragments of this 

 breccia vary in size from those that are very small up to those a 

 foot across. Some of these fragments contain andalusite crystals. 



CONCLUSIONS. 



1. The Conway granite, the granite-porphyry, and the quartz- 

 porphyries, including probably those found in fragments, were 

 formed by the solidification of a single magma. 



The sedimentary rocks of this area, together with the under- 

 lying crystallines, were profoundly and thoroughly shattered, 

 presumably by a disturbance associated with the coming of this 

 magma into its present position. 



2. The shattered condition of the phyllite affords a means of 

 estimating the greatest depth at which this magma could have 

 solidified. Included, as the shattered phyllite was in the molten 

 magma, the latter was not at a depth greater than that of the 

 zone of fracture for the phyllite. 



Joseph H. Perry. 

 Worcester, Mass. 



