8 Geology, &c. of the Connecticut. 
name of it, he will be told it is West River Mountain. And 
on examination he will find that West River empties into 
~~ pepenion from the west, nearly opposite this moun- 
Granile range passing pauses: salads through gc §c. 
_. This granite is generally found at a low level. Almost 
every other rock in the southern part, excepting the alluvi- 
oa, rises hes than this. Along the central and eastern 
parts of Amherst itis mostly covered by geest and alluvion. 
{t appears, however, ase miles south east of the Collegiate 
Tostitution, and I have no doubt that eee stands on 
rett, aiiehd is ae one of the best places for examining 
its ‘especially when we consider its proximity there to pud- 
ding stone. Mount Toby, which is 800 or 900 feet high, 
lies on the western border of the granite and consists prin 
cipally of a peculiarly. conglomerate | rock which appears ‘to 
belong to the coal formation. This pudding stone rises 
400 or 500 feet higher than the granite, and in the interve- 
ning valley the two rocks approach very near each other ; 
although 1 have never been able to find the actual j Junction, 
‘The granite, however, near the padding stone, occurs in 
beds in mica slate, and is separated from the pudding stone, 
by this mica slate, or by hornblende slate, which appears in 
the valley above named, or by an imperfect variety of sie- 
nite. ‘The mica slate in this place, and indeed along the 
whole western border of this range of granite, near the 
northwest corner of the town, it becomes mere quartzose 
slate, having a slight glazing of mica, or mica in small scat- 
tered scales. This quartz is divided in two dncmcae by 
seams oblique to the face of the layers, so as to separate the 
rock into very regular rhombs with different degrees of ob- 
liquity. In hand specimens, indeed, it seems to be limpid 
quartz in very perfect distinct concretions. 
In the valley between these rocks appears to have been 
for ages a war of avalanches between the pudding stone 
and granite ; in which 
