50 NEW YORK STATE MUSEUM 



quartz matrix. There are minute specks of brown titanite and of 

 pyrrhotite and occasional coarsely crystalline patches of dull-green 

 pyroxene with large grains of pyrrhotite. Another variety of this 

 rock is composed chiefly of grains of colorless pyroxene, probably 

 diopside, with rather simple noninterlocking boundaries. The 

 interstitial spaces are filled with an aggregate of zoisite, qviartz 

 and carbonate which appears to be secondary. Small rounded tit- 

 anite grains are abundant. There is an occasional pyrite or pyrrho- 

 tite grain. 



Type b. Quartz-epidote-schist. 



The rock is a dense, siliceous, fine-grained schist with alternating 

 crumpled yellow-green and dark-gray bands. 



It is a fine-grained, quartz-epidote schist, showing granulation of 

 the epidote. Interstitial spaces and lines of weakness are filled with 

 quartz. The quartz bands show considerable contortion, but the 

 quartz is not granulated. It has rather the appearance either of vein 

 quartz or of having been introduced while the rock was being 

 sheared. 



This deformation effect is still more strongly exhibited in thin 

 section than it is in the hand specimen and it is from the microscopic 

 examination particularly that the suggestion has been derived that 

 the deformation represented is in part older than some of the in- 

 jection material. (See accompanying photomicrograph, plates 4 

 and 5.) 



Type c. A graphitic diopside rock. 



A light-gray, hard, rather coarse-grained rock made of a gray 

 pyroxene and flecked with shining scales of graphite. 



The rock is coarse-grained, made of slightly clouded diopside and 

 graphite. It must have been developed by metamorphism from a 

 carbonaceous limestone. Both regional and contact effects are prob- 

 ably present in this rock. 



Type d. A silicated limestone. 



The rock is a limestone, very much sheared so that the calcite is 

 not coarsely recrystallized, but retains all the effects of strain. It 

 contains some quartz and a few diopside grains, iron-stained along 

 the twinning bands. 



Type e. Serpentinous limestone. 



Rather massive, serpentinous limestone, of variable texture, 

 specked with pyrrhotite. 



The rock is a medium-grained limestone with large, rounded, ser- 

 pentine aggregates pseudomorphic after olivine. Small chalcopyrite 

 veinlets cut the calcite. 



