14 NEW YORK STATE MUSEUM 



hornblende-garnet gneisses with a little interbedded quartzite and 

 biotite gneiss. 



Catamount hill area. Catamount hill itself is a practically solid 

 mass of well-bedded biotite-graphite schist or gneiss with some belts 

 of quartzitic rock toward the summit. 



At the old graphite mine by the road west of Catamount hill, 

 the rock which was mined is a rusty looking biotite-graphite schist 

 in very thin layers. Most of this rock, forming a belt 30 to 40 

 feet wide, contains tiny flakes of graphite, but one zone in it only 

 a few feet wide is very rich in large flakes of graphite. In contact 

 with this graphite-rich rock there is a narrow band of limestone 

 containing green pyroxene and graphite. 



Near the road one-fifth of a mile north of the mine there occurs 

 a ledge of quartzitic to granitic looking gneiss with one two-foot 

 wide band containing lenslike garnets up to an inch long. 



Adirondack village area. This small area shows only a few out- 

 crops. A small exposure of limestone just east of the village con- 

 tains some graphite and green pyroxene. By the road one-half of 

 a mile south of the village, there occurs a ledge of bedded horn- 

 blende-biotite gneiss. At the southern end of the area there are 

 several good exposures of variable rocks, mostly hornblende gneiss, 

 biotite gneiss and pyroxene-garnet gneiss. These are mostly well 

 bedded but shot through with some coarse granite. No outcrops 

 occur along, or just east of, the map boundary here, but, judging 

 by Doctor Ogilvie's Paradox lake map, this Adirondack village 

 area of Grenville probably extends across the boundary. 



Areas on the shores of Schroon Lake. At the southern end of 

 Isola Bella there is a mass of limestone 20 feet long, really an 

 inclusion in the granite. This limestone contains pyroxene, quartz 

 and some graphite. 



At Grove Point there are two exposures by the lake shore, one 

 being limestone with bunches and strips of green pyroxene gneiss 

 kneaded into the mass, and the other pyroxenic and hornblendic 

 gneisses with a little associated limestone. 



A few rods south of the Grove Point Grenville, syenite con- 

 tains a long, narrow inclusion of Grenville limestone. 



On the lake shore one-half of a mile east of South Schroon, 

 limestone with patches of green pyroxene gneiss twisted into it 

 shows in a good exposure. 



Areas northwest of Schroon Lake village. The small lens- 

 shaped area shown on the map i mile northwest of the village con- 



