1 10 Geology of Veerfield, ^c. 



as will be more particularly mentioned hereafter. Globulai* 

 fconcretions of greenstone are conmion in this amygdaloid^ 

 several inches in diameter, and of greater specific gravity than 

 the other parts of the rock. A great number of columns occur 

 in the same range, having from three to six sides. Some of* 

 them afe quite regular, and are well articulated, exhibiting at 

 their joints considerable concavities and convexities. They 

 are from one to thirty feet long, and, in their natural position, 

 incline a few degrees to the east, as may be seen in the view 

 of strata with the map; A few have been noticed that make 

 lateral curves. One of these hexagonal columns measures at 

 one end as follows : — Diagonals, 27, 29, and294^ inches ; sides, 

 16|, 13^, 11^, 17, 11|, and 16i inches. The convexity of 

 this column is a little more than an inch. The best instances 

 of these prisms occur one mile east from the village of Deer- 

 field. 



Masses of greenstone are found at considerable distance 

 from the range, among the puddingstone. One has beert 

 noticed weighing many tons, a hundred rods from the" range of* 

 greenstone, and on much higher ground. Some of these 

 scattered fragments contain chalcedony. A specimen of pe- 

 trosiliceous porphyry has been found among the same pud- 

 dingstone, and also a mass of singular, though not well defined^ 

 amygdaloid, whose base is similar to wacke^ and imbedded 

 substances are calcareous spar, chlorite, and green earth. 



The elevation in the north part of Sunderland, called Toby, 

 from 800 to 900 feet high, is chiefly conglomerate, red, brown j 

 or greenish, which, in some parts, alternates with chlorite 

 slate, secondary argillite, and a sandstone that seems to be 

 passing into gray wacke slate. Some of the imbedded masses 

 in this puddingstone are quite large, its cement is frequently 

 calcareous, its aspect is singular, and it is Very different from 

 the puddingstone before described, on the opposite side of the 

 river. At the foot of this mountain, in the bottom of Con- 

 necticut river, distinct impressions of fish are found on a 

 schistose rock, like the one above mentioned as passing into 

 gray wacke slate. This same species of slate occurs in seve- 

 ral other places at the bottom of Connecticut river, as at the 



