4 JOSEPH H. PERRY 



intimately associated are the original fibrolite and pseudomorphs 

 after andalusite. As the schist becomes fibrolitic, it is distinctly 

 and quite thinly laminated. It also contains garnets and tourma- 

 line and, rarely, graphite in fine scales. 



In the middle of the northeast slope this schist is destitute of 

 fibrolite and pseudomorphs of andalusite; it is characterized by a 

 dark green mica of soapy feel, and a very fine, white sericite. 

 The latter is in fibers as fine as the fibers of fibrolite, and occurs 

 in the schist just as fibrolite occurs in other parts of this schist. 

 The sericite is evidently fibrolite changed into sericite, as is proved 

 by the finding of a mass of fibrolite partly so changed. In the 

 general sericitization to which this schist has been subjected the 

 fibrolite, in places, has been changed as well as the other miner- 

 als. This sericitization indicates the permeation of this schist by 

 potash solutions. These variants are considered as one schist, 

 and are so colored on the geological map. 



The second phase of the mica schist, found in the mountain 

 and the surrounding area, may be seen between the i,6oo and 

 1,700-foot levels on either side of the road on the southern 

 slope. It is a gray, thinl}^ laminated, finely granular, quartzose 

 mica schist, containing, in addition to the granular, glassy quartz, 

 a little fine, brown mica and fine, light green hornblende. This 

 schist is cut by lamination planes and joints into thin, rectangular 

 slabs. In position it is conformable with the fibrolite-andalusite 

 schist above. The boundary between the two is a zone of alter- 

 nation. This indicates either an alternation of sediments or an 

 interfolding along the border. I judge that the former is the 

 case here, because in other parts of this area the quartzose schist 

 blends into, and alternates with, the third phase of the mica 

 schist. In only this small area on the southern slope is there 

 enough of this quartzose schist by itself to be represented as a 

 distinct area on the map. 



The third phase of the mica schist occurs below the second, 

 on the southern slope, and is the first rock met in going up the 

 mountain road. This is a very rusty, thinly laminated, fre- 

 quently fissile, muscovite, biotite schist which often becomes so 

 quartzose as to be a micaceous quartzite. The extreme rustiness 



