Geology, &c. of the Connecticut. 63 
carbonate of lime. At sitar ees I do not know its exact 
relative situation. 16. Bituminous us carbonate beg che be in the 
coal pire at Souihingehe and Middleto 
n this series of rocks, and in this only has coal been 
found along das Connecticut. It occurs at Durham, Mid- 
dletown, Chatham, Southington, Berlin, Somers, Ellington, 
Enfield, South Hadley, and Southampton. In most instan- 
ces it is. ‘highly bituminous and burns freely. The seams of 
it are usually quite thin, oe, exceeding an inch in thick- 
ness, yet often they are numerous. In Berlin, the coal oc- 
curs in greenstone in a vein nof crystallized quartz. (Journal 
of Science, Vol. 5, p. 44.) In Southington it is found in 
shale—in Somers, Ellington and Suffield, in friable argillace- 
ous slate, (No. 3 above) in Enfield, in beds in gray micaceous 
sandstone; (No. 4. above) also in the same rock, (‘ granu- 
lated schistose aggregate” of Eaton, vide Journal of pa 
Vol. 1. p. 136,) in the drift of the S. Hampton lead 
The Connecticut river, in its passage between ‘5 ene 
~ of Gill and Montague, has cut through the coal formation, 
except asingle ridge of greenstone on the west, as may beseen 
by referring to the map. Through a considerable part of this 
distance, especially in the most in terestingpart, the bassetting 
of the strata is completely laid bare; and I have annexed to 
the map a profile of their order and dip, which I shall now 
proceed to describe. It is a vertical section, crossing the 
map at the falls in Gill and the strata nearly at right angles, 
extending on the west to the western part of Shelburne, so 
as to include a few other rocks beside the coal formation, 
and on the east, to the mouth of Miller’s river. The chief 
object of this profile i is to give a better idea of the coal for- 
mation than could be obtained by mere verbal description. 
That part of it, therefore embracing those rocks, is putdown 
from a larger scale than the other parts, otherwise the nu- 
merous alternations could not have been represented. Es- 
pecially that part between No. 8 and 40, is laid down from 
a larger scale than the rest of the coal formation; because 
hse oe the most interesting oti of it and most distinctly laid 
on the north bank of the Connecticut, extending 
end the falls to the high pecodtiane ridge 100 rods west of 
it. This part was observed most attentively, and a quadrant 
converted into a clinometer, was used for determining the 
*Bituminous marl slate?— Ed. 
