Pe 
Geology, &c. of the Connecticut. 31 
ing it in several places, is to pass by the right hand road from 
Belchertown congregational meeting-house, to the meeting- 
house in Ludlow. 
The narrow deposite of sienite which is Gree mentioned 
above, as occurring in Whately, is somewhat different in its 
characters. Let the observer proceed northerly on the 
main road from the congregational meeting house one mile, 
till he comes to the farm ofa Mr. Crafts. On the left hand 
side of the road he will find a ledge of rocks which are 
greenstone slate, nearly allied to hornblende slate, and some- 
times to chlorite slate. J.et him cross these strata westerly, 
about fifty rods, and he will come to a deposit of decided 
unstratified primitive greenstone, about twenty rods wide. 
Immediately succeeding this rock, he will find the sienite 
above named. It consists of nearly equal pro) ns 0 
felspar and hornblende, the. latter of a dark green and of a 
distinctly crystalline structure; and the former white and 
—— or very finely granular, entirely destitute of a foli- 
ted structure, or lust These 
ingredients seem 
‘3 be promiscuously blended, ae the rock appears to be 
peculiarly well adapted for being wrought and polished for 
useful and ornamental purposes. e bed is not very ex- 
tensive, only about six rods wide at the place above men- 
— and I have never been able to trace it more than one 
r two miles. It is separated from the mica slate by a nar- 
row stratum of greenstone slate. 
Sienite, or sienitic granite, sete in many eee places 
along t onnecticut; but in n o othapepinne she e I found 
it extensive enough to deserve a place on the map, except 
perhaps in Chatham, and with the relative situation of this I 
am not sufficiently well acquainted. Where I have crossed 
it, it appeared to form a bed in porphyritic hornblende slate. 
8. Primitive Greenstone.—Cleaveland. 
Colored Carmine or Rose Red, and marked “by parallel lines 
crossing sack other. 
This is one of Werner’s varieties of primitive trap. If it 
be asked what that is, I should suppose Mr. Maclure’s supposi- 
tion to be not an improbable one, that “what Werner calls 
primitive trap may perhaps be compact hornblende; or per- 
