14 NEW YORK STATE MUSEUM 



part of the area shows a number of exposures of dark hornblende- 

 feldspar-garnet gneiss with red garnets up to one-half of an inch 

 in diameter. A little quartzite was noted at one place. 



About one-half of a mile east of the southern end of Mirror 

 lake there is a large outcrop of dark, very gneissoid, but not banded, 

 hornblende-feldspar-garnet gneiss with garnets up to an inch or 

 more in diameter often inclosed in envelops of hornblende. 



The small Grenville masses on and near Cobble hill, and i mile 

 west of Coldspring pond, are hornblende gneisses, two of these 

 masses being distinct inclusions in the syenite. 



On the mountainside i^A miles north of Eagle Eyrie (a few 

 rods above the trail) there is an interesting exposure, several hun- 

 dred feet long, of white, rather coarse-crystalline calcite marble 

 with scattering small crystals of phlogopite, pyroxene and green 

 apatite. On the east side it is in contact with syenite, while on the 

 west it seems to overlie, in part at least, gray feldspar-quartz-garnet 

 gneiss (presumably Grenville). 



In the bed of a small brook one-half of a mile south of Owen 

 pond there is a small exposure, clearly an inclusion, of Grenville 

 limestone — some pure white and some rich in mica, pyroxene and 

 pyrite — associated with Grenville gray feldspar-pyroxene gneiss. 



Near Winch pond the inclusion of Grenville (see map) in the 

 syenite is a light-gray feldsipar-quartz gneiss. 



In the Wilmington notch a good exposure at the edge of the 

 river (see map) shows well-bedded Grenville green pyroxene- 

 feldspar gneiss and light-gray calcareous pyroxene-quartz gneiss, 

 each about 20 feet thick. 



The small area in Sunrise notch consists of quartzitic and 

 pyroxenic gneisses. 



Areas in the vicinity of Keene village. On tlhe western slide 

 of the gorge of Ausable river (close to the map limits) there is an 

 outcrop of Grenville limestone and close by it an outcrop of Gren- 

 ville quartz-biotite gneiss or schist. 



The Grenville which constitutes the hill from one-half to ij4 

 miles north of Keene is quite variable. At the south, hornblende- 

 feldspar gneisses and quartzites are interbedded with some light- 

 gray feldspar-graphite gneisses. The middle portion of the hill is 

 mostly hornblende-feldspar gneiss. In the northern portion of the 

 hill the rock is mostly green pyroxene-garnet gneiss with some 

 interbedded hornblende gneiss and limestone, the limestone con- 

 taining graphite and green pyroxene. The western of the two 

 limestone outcrops shown on the map is the larger. 



