234 Geology, Mineralogy, Scenery, &e. 
Descending the hill, trap and argillite and chlorite slate, 
several times alternate, and form the cliffs through which the 
road has been wrought. 
Scenery. 
Now a combination of fine objects, breaks upon the view. 
On the left the magnificent ridges of secondary trap, (men- 
tioned in the commencement of the tour,) stretching away 
North, farther than the eye can distinguish, and forming the 
barrier of luxuriant vallies, whose fine verdure is admira- 
bly contrasted with their naked and lofty precipices; fur- 
ther East, other and still othe: ranges succeed, till their 
faint outline is blended with the distant sky ; immediately 
at our feet, is the great alluvial plain, from which rise the 
smoke and the spires of New-Haven, and further still its ex- 
fensive bay, surrounded by alluvial and secondary, but ter- 
minated at its mouth, by primitive country, closing in upon 
both sides; and much more remote, but distinguishable in 
the distant horizon, appear the shores and coast of Long-Isl- _ 
and, with the intervening sea and the craft and ships which 
it bears on its bosom. 
General Remarks and Conclusions. 
In Dr. Bruce’s Journal, Vol. 1. pa. 139, 1 have given some 
account of the secondary greenstone formation, on which 
New-Haven stands. Itis obvious, from the preceding state- 
ments, that immediately on leaving this plain, the rocks in 
the order in which they are described above, become prim- 
itive, and it is worthy of observation that, taking into view 
an extent of thirty miles, the structure of the country pre- 
sents, almost precisely the arrangement and succession of 
rock formations, which are laid down by Mr. Werner. 
1. Clay slate, including beds of trap, and passing occa~ 
stonally into chlorite slate.* 
* Within a mile south of the road, on which my returning tour crossed 
these slaty rocks, commence beds of serpentine marble, which continue, 
eight or ten miles to the sea, and become the beautiful material, so nearly 
resembling Verde Antique, now largely quarried and wrought. This ex- 
traordinary bed of marble and serpentine, is well worthy of a more par 
tienlar account. 
