14 NEW YORK STATE MUSEUM 



end of the bridge, there is a ledge of crystaUine limestone about 30 

 feet long. This graphitic limestone is perfectly stratified in nearly 

 straight bands interbedded with pyroxenic gneiss. It dips at a high 

 angle. Another small exposure occurs at the very sharp turn in 

 the road one-eighth of a mile southeast of the bridge. A very inter- 

 esting large exposure of limestone has been opened up just east of 

 the small pond along the branch railroad not shown on the map. 

 The ledge 200 feet long consists of medium-grained crystalline lime- 

 stone containing many small crystals of green pyroxene and many 

 flakes of graphite. Considerable pyroxenic and hornblendic 

 gneisses are directly associated with the limestone, the whole mass 

 being notably folded. 



By the river and railroad nearly i mile northeast of Thurman 

 station there are several large exposures of well-stratified Grenville 

 green pyroxene and mica gneisses, and quartzite, in layers i to 5 

 feet thick in contact with granite on the north side. 



Just north of the road three- fourths of a mile north-northeast 

 of Thurman station there is a small area of quartzitic and " rusty " 

 Grenville gneiss. 



The small area near the southwestern end of Warrensburg vil- 

 lage shows but one exposure. It is crystalline graphitic limestone 

 associated with some hornblende gneiss. 



In view of the fact that limestone is extensively developed just 

 north of Warrensburg, it is probable that much of the broad valley 

 in the vicinity of that village is imderlain with limestone, but the 

 almost total lack of exposures renders it too uncertain to represent 

 that rock on the geologic map. 



A very small area of Grenville, mostly thin-bedded biotitic and 

 " rusty " (pyritous) gneiss or schist injected with some pegmatite 

 and granite, occurs at the eastern base of Bald mountain. 



Areas in the vicinity of Stony Creek village. Five small areas 

 of Grenville are mapped within a few miles to the northeast, north 

 and northwest of Stony Creek village. One-half of a mile north- 

 east of the village center the rocks are hornblendic and pyroxenic 

 gneisses interbedded with some limestone forming a narrow belt 

 within the granite. A number of outcrops of similar rocks occur 

 in the area i}i miles northeast of the village. There are several 

 exposures of fairly well-bedded pyroxenic gneiss and hornblende- 

 garnet gneiss 1^2 miles north-northwest of the village. Most of the 

 rock 2% miles north of the village is limestone involved with con- 

 siderable green pyroxenic gneiss and a little quartzite. There are 



