28 NEW YORK STATE MUSEUM 



form in composition and structure, and free from amphibolite 

 inclusions and pegmatite. It grades into the surrounding granite 

 on all sides. 



The coarse-grained granite of the small area 2 miles north of 

 Stony Creek station is pink and well foliated. 



The small body of pink, moderately coarse to coarse-grained 

 granite on Bald mountain shows a great range in degree of folia- 

 tion. In the midst of the area the foliation is very highly developed 

 with the minerals extremely flattened into a leaf-gneiss. 



In the area south of Conklingville many exposures show the rock 

 to be a pink to gray, coarse-grained, mostly very highly foliated 

 granite with the feldspars and quartzes extremely flattened. It con- 

 tains a little pegmatite and silexite, and it is locally somewhat 

 porphyritic. 



The area southeast of Linwood school does not show good out- 

 crops except on the west and east. On the west there are many 

 exposures of pinkish gray, coarse-grained, somewhat porphyritic, 

 biotite granite, mostly highly foliated. A good many moderately 

 coarse-grained parallel pegmatite dikes cut these ledges across the 

 foliation at a high angle. Some of these dikes, 2 to 4 feet wide, are 

 traceable 100 to 200 feet. On the east the granite is only moder- 

 ately coarse grained, pink and biotitic more closely resembling the 

 medium-grained granite as above described. 



In the area in the vicinity of the reservoir 3^ miles east of 

 Lake Luzerne, and also in the area north of the reservoir, most of 

 the coarse-grained granite is of the usual kind. Locally it is more 

 biotitic than usual, slightly porphyritic, and carries some garnets, 

 thus somewhat resembling the granite porphyry below described. 

 Such facies occur in the southern half of the reservoir area where 

 the rock contains local bands or belts of medium-grained granite or 

 grano-syenite without sharp boundaries. 



Granite porphyry. The two comparatively small areas sep- 

 arately mapped as granite porphyry between Potash and Bucktail 

 mountains are quite likely connected under the narrow belt of Pleis- 

 tocene deposits. They represent some interesting but rather puzzling 

 features. The rock may be best examined in the northern of the two 

 areas where excellent exposures occur along the state road, especi- 

 ally in the quarry (see map). By the state road near Stewart brook 

 the pinkish gray, richly biotitic rock contains many phenocrysts of 

 pink, more or less flattened granulated feldspar set in a moderately 

 coarse-grained, gray matrix of feldspar, quartz and biotite. There 

 are a few scattering red garnets. The well-developed foliation is 



