GEOLOGY OF THE LUZERNE QUADRANGLE 27 



Between i and 2 miles east of Stony Creek station the typical 

 pink medium-grained granite shows local variations to syenitic and 

 aplitic facies parallel to the foliation. 



Practically all the outcrops observed in the southeastern part of 

 the town of Day (except those toward Conklingville) are pink, 

 medium to moderately coarse-grained, highly foliated granite. 



Most of the rock of West (Hadley) mountain is pink, medium- 

 grained, hornblende granite, but variations to moderately coarse- 

 grained and moderately fine-grained (aplitic) facies are common. 

 The distinct foliation usually shows a general east-west strike, but 

 there are many local variations, especially around the small body of 

 gabbro (see map) where the foliation is wavy and even contorted 

 with strikes in all directions. This granite contains small amounts 

 of amphibolite (metagabbro) in the form of more or less digested 

 lenses and shreds, this being especially true near the gabbro. A 

 thin section of the granite from near the eastern base of the moun- 

 tain is represented by no. 23 of the table. 



The top of the mountain next south of West mountain consists 

 of pinkish gray, medium to moderately coarse-grained, variably 

 foliated, hornblende granite with some small pegmatite and silexite 

 bands mostly parallel to the foliation. Very locally a little amphibo- 

 lite occurs. 



Near the road a little northwest of Gailey hill, medium-grained, 

 well- foliated, biotite granite contains considerable pegmatite 

 arranged in bands parallel to the foliation. 



The hill i mile southwest of Hadley village consists of medium 

 to fine-grained, pinkish gray, well- foliated, biotite granite which 

 contains a few thin layers of amphibolite (metagabbro) and some 

 lenslike bands of pegmatite with indefinite borders parallel to the 

 foliation. 



The face of the mountain just west of Thurman station is pink, 

 medium-grained, well-foliated, biotite granite containing some nar- 

 row bands of amphibolite and pegmatite parallel to the foliation. 



On the side of the hill i mile west-southwest of Athol pink to 

 gray granite varies to grano-syenite. Very locally it contains some 

 bands of silexite and amphibolite, and a little garnet gneiss. 



Coarse-grained granite. Several areas are separately mapped 

 as coarse-grained granite. This rock is in no way sharply delimited 

 from the medium-grained granite. The largest mass, which occu- 

 pies over 2 square miles near the middle of the quadrangle, clearly 

 shows its relation to the medium-grained granite on all sides. This 

 coarse-grained, pink, moderately foliated granite is mostly very uni- 



