32 NEW YORK STATE MUSEUM 



the lowest member of the section, and of which the schists are 

 presumably transitional contact phases, is not exposed, but is doubt- 

 less to be foimd at no great depth at this localit}^ Microscopically 

 the garnetiferous schist consists of hornblende, garnet, quartz and 

 scapolite, with accessory pyrite, biotite and magnetite. The scapo- 

 lite occurs in felted areas, a manifest replacement of another min- 

 eral of which no trace remains and which may have been feldspar. 

 Quartz is abundant as spindle growths, and is sometimes residual 

 in the midst of scapolite. The green hornblende, generally fresh 

 and intergrown with quartz and skeletal garnet, is frequently seen 

 altering to secondarv' calcite and serpentine. Sometimes in areas 

 where this process has been carried nearest to completion, only 

 small shreds of hornblende are left unaltered. 



This rock shows gradation to the black amphibolite, which con- 

 sists almost exclusively of dark green hornblende and a varying 

 but always minor amount of quartz. It is strongly injected with 

 abundant thin sheets or dikes of pink granite, which alternate in 

 striking color contrast with the amphibolite. This injection gneiss 

 is succeeded abruptly by the main body of pink granite gneiss, which 

 for the distance of a few feet from the contact, contains a few long, 

 narrow amphibolite inclusions. Some of these are evidently in the 

 process of being softened or partially dissolved by the granite, and 

 are surrounded by a continuous border of coarse pegmatite granite. 



The abundance of scapolite in the garnet amphibolite, coupled 

 with the transition to an intimate injection zone, thence through an 

 intermediate and gradually diminishing succession of detached 

 xenoliths to the main body of granite, strongly suggest that the 

 series is one of increasing intensity of contact metamorphism on a 

 calcareous coimtrv^ rock. 



The occurrence first mentioned, that at Eddy, differs from this 

 in that the border amphibolite can be demonstrated to be practically 

 a continuous belt for several miles (see plate 5, upper figure), 

 though in this respect nothing can be definitely asserted with regard 

 to the garnetiferous schist. The latter rock, however, occurs adja- 

 cent and parallel to the hornblende schist at at least three places : 

 (i) for a short distance at the head of the granite reentrant south 

 of the crossroads at Eddy; (2) at a point about three fourths of a 

 mile south-southeast of the railroad bridge over the headwaters of 

 Church brook, and (3) at the west border of the sheet. The amphi- 

 bolite itself may locally be garnetiferous, as south of Eddy and at 

 the northeasterly point of the granite lobe west of the village. The 



