l6 NEW YORK STATE MUSEUM 



outcrops. Parts of the latter rock are porous, probably due to 

 weathering out of calcareous material. Just west of Middle Kilns, 

 by the road, well-banded hornblende-feldspar gneiss shows in a 

 good ledge. The Grenville at the base of Catamount mountain is 

 mostly dark hornblende-feldspar gneiss, often garnetiferous. In 

 the quarry (see map) in this area there is a fine big exposure of 

 very coarse crystalline limestone with some portions containing 

 large irregular masses of clear quartz and one-fourth to one-half 

 inch crystals of dark-green pyroxene and pale bluish green apatite. 

 Other portions of this limestone contain considerable titanite. 



Areas near Franklin Falls. The Grenville area east and north 

 of Franklin Falls shows very fine outcrops. By the roadside, one- 

 third of a mile north of the village, there is a large exposure of 

 distinctly bedded, impure, badly weathered limestone containing 

 quartz, graphite and pale-green pyroxene. It is associated with 

 some hornblende-feldspar gneiss and calcareous quartzite with 

 flakes of graphite and phlogopite and specks of pyrrhotite. On the 

 road just east of Franklin Falls there are good ledges of greenish 

 gray quartz-pyroxene gneiss, some of which contain graphite. 

 Steep ledges forming the north bank of the river just opposite are 

 of similar rock. On the road one-half of a mile east of the village 

 there are small exposures of rotten graphitic limestone and 

 quartzitic gneiss with graphite. The southern part of the area 

 consists of hornblende gneiss and quartzite interbedded. 



The small area i^ miles east of Franklin Falls shows greenish 

 gray quartz-pyroxene gneiss not certainly in situ. 



At Woodruff fall coarse crystalline limestone containing graphite 

 and green pyroxene shows in an old quarry. A few rods to the 

 south there are ledges of hornblende-feldspar gneiss. The other 

 two limestone outcrops indicated on the map are associated with 

 pyroxene gneiss. 



In an old prospect hole, one-half of a mile south of Franklin 

 Falls, coarse crystalline limestone with much graphite is exposed. 



The small area i mile east of Franklin Falls shows hornblende 

 gneiss and quartz-pyroxene gneiss interbedded. 



Anorthosite Series 



General statements. So fa'r as now known, the anorthosite 



was the first of the great intrusive bodies which broke through the 



Grenville strata. This rock is almost wholly confined to an area 



of about I2CXD square miles mostly in Essex and Franklin counties. 



