56 NEW YORK STATE MUSEUM 



map. They represent masses of Whiteface anorthosite which have 

 been more or less shot through, and cut to pieces, by syenite or 

 granite. Individual outcrops within these areas are usually either 

 good anorthosite or good syenite or granite, but they are too much 

 involved to be separately mapped. 



The largest area, extending from i to 3 miles east of Wilmington 

 notch, is quite typical. There are many outcrops of clearly recog- 

 nizable Whiteface anorthosite and of syenite with contacts visible 

 at several places. Such contacts as, for example, on the ridge at 

 the northwestern border of the area, are usually not perfectly sharp 

 as though some fusion of the anorthosite by the syenite magma took 

 place along the immediate borders between the two rocks. Actual 

 fusion on a considerable scale did take place on the eastern side of 

 the area as shown by the small body of assimilation rock (Keene 

 gneiss) on the map. This whole area is a fine illustration of a 

 mass (about i^ square miles) of Whiteface anorthosite cut 

 through by many intrusions of syenite of considerable size, but 

 where apparently the temperature of one or the other, or both, of 

 the rocks was not high enough to permit more than slight fusion of 

 the anorthosite along the contacts. 



The long, narrow area traversed by the river between High fall 

 and The Flume contains a number of interesting exposures along 

 the river. The Whiteface anorthosite has been badly cut through 

 by intrusions of syenite, such phenomena being well exhibited in 

 ledges by the river within one-third of a mile east of High fall. 

 Small inclusions of Whiteface anorthosite in the syenite and par- 

 allel to its foliation occur in a ledge by the river one-half of a mile 

 southwest of The Flume. An S-foot boulder of syenite near the 

 base of Little High fall, one-third of a mile east of High fall, con- 

 tains several distinct inclusions of Whiteface anorthosite without 

 very sharp contacts against the syenite. 



The little area near the eastern end of M^ilmington notch con- 

 tains mostly good syenite with considerable Whiteface anortho- 

 site as bandlike inclusions through it. 



In the gorge of the river one-half of a mile south of Keene, there 

 are excellent outcrops of Whiteface anorthosite cut by a consider- 

 able mass of coarse, rather porphyritic granite, with small tongues 

 of the granite extending into the anorthosite. The anorthosite is 

 the quite normal Whiteface type and clearly gneissoid. The granite 

 is pinkish brown, gneissoid, and medium grained with scattering 

 phenocrysts of feldspar. Much of the mixed rock here is badly 

 broken up due to crushing in a fault zone (see plate 21). These 



