Geology, <^c. of lh& Gonnecticut, 63 



carbonate of lime. At Northford. I do not know its exact 

 relative situation. 16. ^Bituminous carbonate of lime,in the 

 coal formation at Southington and Middletown. 



In this series of rocks, and in this only, has coal been 

 found along the 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, rarely exceeding an inch in thick- 

 ness, yet often they are numerous. In Berhn, the coal oc- 

 curs in greenstone in a vein of 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 Science, 

 Vol. l.p. 136,) in the drift of the S. Hampton lead mine. 



The Connecticut river, in its passage between the towns 

 of Gill and Montague, has cut through the coal formation, 

 except a single ridge of greenstone on the west, as may be seen 

 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 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 put down 

 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 

 this is the most interesting part of it and most distinctly laid 

 bare on the north bank of the Connecticut, extending 

 from the falls to the high greenstone 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 sltds?— Ed. 



