32 Geology, Sc. of the Connecticut. 
haps the newest floetz trap when it happens to cover the 
primitive.” (Journal of Sci. Vol. 1. p. 212.) Yet there are 
two circumstances in regard to the rock here denominated 
primitive greenstone, along the Connecticut, which have le 
me to doubt its exact indentity with our newest floetz trap, 
or secondary greenstone. 1. The primitive greenstone is 
never amygdaloidal; while a great part of the secondary is 
so. 2. ‘The primitive greenstone not merely covers other 
rocks, but forms beds in them. An example of this may 
‘be seen one mile east of the Milford marble quarry on what 
is called the old road leading to New-Haven ; where the 
greenstone lies between strata of a rich intermediate, between 
eae slate and mica slate, = the rocks have every 
ce of being contemporan 
>yimiflive greenstone is _oaiedi in the oe places on 
e map, viz. at West-Haven and Milford—at Wolcott—at 
Whee, in the western part of Northfield and north part 
of Gill. In regard to that in Wolcott, or the Eastern part 
of Waterbury, I know but little, it being several years since 
I observed iy pre oes snow being on the ground at the 
time. I put it down merely fo for the sake of pointing out its 
locali 
The: most extensive deposit of the rock is at West iirc 
and Milford; on both sides, but especially on the east side, 
of the Verd Antique stratum. The hummocks of it that 
appear very frequently, but irregularly, very much _ re- 
semble the detached hills of secondary greenstone, except 
that they are less elevated and the blocks of debris are usual- 
ly Jarger. A little south of the Derby turnpike, this is the 
first rock that shows itself as we ascend from the alluvial 
plain of New-Haven on the Humphreysville turnpike also, 
there is but a narrow stratum of chlorite slate separating it 
from the alluvion 
This greenstone often becomes stratified on both sides of 
eo ridge, forming greenstone slate. At first, we perceive 
rtial and interrupted stratification ; and in a few feet it 
isa decided, extending through the whole mass. 
There is also frequently seen a double stratification; 3; one set 
of planes crossing the otherrectangularly or obliquely. Vell 
characterized greenstone slate, however, is not abundant in 
Milford or West Haven. It usually soon passes into chlo- 
ritic slate, or even into a bastard mica slate. An account of 
Sa ee MR ofl in St ra 
pth i gaiig er paee Cay gh) A 
