Geology, ^c. of the Connecticut. 28 



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. 



1. A more exact determination, in many instances, of 

 the boundaries of the several formations. 



2. Further 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 rtd sandstone, but also in the coal formation, and evea 

 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. 



6. A more thorough search to ascertain whether all 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. 



8. An 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 Souths 

 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 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 explora- 

 tion, and promises the diligent student much fruit. 



Meteorological Fact. 



The following circumstance, although connected with 

 geology, does not strictly come within the limits of this 



* Dr, Cooley informs me that he has recently discovered another locali- 

 ty of ichthyolites in Deerfield, about three miles from the locality in Sun- 

 derland. 



