Geology, &c. of the Connecticut. 23 
there are desiderata in the whole. But some parts are more 
deficient than others ; and I shall take the liberty of noting 
some of those points which seem more particularly to de- 
mand the further attention of the geologist. Among these 
the following may be named. 
- A more exact determination, in many instances, of 
the boundaries of the several formations. | 
urther examination of the exact relative position of 
the old red sandstone and the coal formation. 
3. Further search for greenstone dikes, not only in the 
old red sandstone, but also in the coal formation, and even 
in primitive rocks. 
4. Whether the beds of secondary greenstone detach 
veins from one to the other, as in the isle of Sky. 
5. A further examination of the granitic beds, to deter- 
mine whether like connecting dikes or veins may not be 
found uniting them also. LBGCOE ran seioeth 49 
+ A more a arch to in wv ler ail our 
granite does not exist in the form of beds and veins. 
7. ‘To find more instances in which the coal formation and 
greenstone form alternating beds. 
n examination of the beds of clay and gravel, found 
along the Connecticut, for shells and other organic remains. 
9. Further search in the coal formation for organic re- © 
mains.* 
10. Examination of the bituminous limestone of South- 
ington, especially with the query of Prof. Silliman in mind, 
(Journal p. 63, vol. 6.) whether this rock may not itself be, 
or be connected with, bituminous marl slate ? 
1, The extensive range of greenstone, running from Ber- 
lin to Amherst has as yet been but little examined for mine- 
rals, as well as many other greenstone ridges. Indeed, the 
mineralogy of this whole region requires farther exp) 
tion, and promises the diligent student much fruit. 
Meteorological Fact. 
The following circumstance, although connected with 
ogy, does not strictly come within the limits of this 
* Dr. Cooley informs me that he has recently discovered another locali 
locali-+ 
ty of ichthyolites in Deerfield, about three miles from the locality in San- 
derland. 
