Junction of Trap and Sandstone. 



Ill 



inches in thickness, and about three feet in width, standing nearly 

 vertical in a bed of trap : (/) is a mass about three feet square, 

 similarly situated : (c and d) are fragments of sandstone about three 

 feet wide and two feet thick, surrounded on all sides by trap, 

 except the front, where they may be seen in the bank of 

 the road. A small stream of water crosses the road between (e 

 and d), and descends the hill in the direction (/, m) into a deep dell 

 or valley which commences a few rods west of that place, and ex- 

 tends down by the side of the Cheshire road, and within a few rods 

 of it, until it approaches near the turnpike, when it suddenly turns 

 south, and passing the peak (A;), spreads out into a plain in the river 

 meadow. The bed of this brook from {I) to the bottom of the val- 

 ley, may be seen from figure 7, and a profile section of the same, 



figure 8. 



Fig. 7. ^ 



Surface View. 



Fig. 8. 

 Profile View. 



Rise 32 feet. Distance 74 feet. 



The same appearances are presented in all these dykes at their 

 junction, as in the one at Mr. Hill's manufactory, and the change 



