14 Geology, &c. of the Connecticut, 
The veins traversing seinite are most frequently granite, 
felspar being of a flesh colour. They are more numerous 
in this than in any other rock, and are often intersected by 
one another and by thin veins of epidote. The crossing of 
these veins has produced many very interesting and singu- 
lar displacements: of portions of the rock. Where one 
vein is cut off by the intersection of one that is newer, it 
is not unfrequent to observe a lateral removal of the former 
with the whole mass of the rock surrounding it, from one 
to six inches. The vein itself, which is thus removed, is 
rarely altered or injured. 
One of the most complete and curious cases: of. this kind 
is exhibited in Fig. 6... _ -was sketched by the eye without 
accurate admeasurement. A. B. C. is a triangular mass of 
Sienite 5 the sides of wh which are 6, 4, and 10 feet. A.B. is a 
fissure in the rock: B. C. a vein of epidote and A C. the 
line marking the lowest fini of the rock above the soil. 
he whole rock is unbroken and as firmly united as any 
rock of this character ever is. There appear originally 
to have been two. veins of granite traversing the rock in its” 
longest direction, the smallest an inch wide at one end mee 
widening towards the «ther, and the 
These have been cut through ansatrinpaly sag ‘by! vies 
d, &c. represent the veins of dopidows which are 
rarely more than one quarter of an inch thick, and a few oc 
which are represented on the plate 
c isa mass of gneiss or mica slate imbedded i in the sienite 
and crossed by the granite vein: 
(Vv es of this rock will be: described when we come 
to. speak of.s 
In those ais cmH are . stratified these veins raked bing | 
ible angle with the direction of the strata. And if Ido 
not mistake, the nearer they approach to the same direction — 
as the strata, the broader they become, and have a nearer 
resemblance to beds. Sometimes they approach so near - 
the same course as the layers of the rock they eaaerny 
that it requires nice examination to determine whether they 
deviate at all. A good example of this occurs ina locality 
which many geologists have visited, and which many more 
