218 SURFACE GEOLOGY. 
dozen walls would so slightly exhaust the supply that none of the boul- 
ders would be missed. The largest boulder represented weighs about 
1,300 tons. On looking across the valley, similar boulders, but less abun- 
dant, can be seen on the Vermont side. I suppose they extend beneath 
the intervening meadow the whole distance, and therefore present us 
Fig. 53. MORAINE IN STRATFORD. 
with an admirable example of a terminal or frontal moraine. The mate- 
rial corresponds closely with the granite quarried a few miles up the 
Nulhegan river by the side of the Grand Trunk Railroad. The ice there 
seems to have descended the Nulhegan river before joining the frozen 
stream of the Upper Connecticut. Pl. I shows a projection of glacial 
drift into the valley, at Horseshoe pond, in Northumberland. This 
promontory is suggestive of other terminal moraines farther to the south. 
Ido not recall their nature, so as to say definitely whether the resem- 
blance is only accidental. It might be added, that the drift hills on 
Israel’s river approach each other closely, just above Lancaster village, 
in the manner of a frontal moraine. 
The Merrimack Movement. The limits of this particular ice mass 
would be naturally the east and west water-sheds, while the northern 
