2l8 



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. S3- MoRAiN'E 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. PI. 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, 

 I do 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. 



T/ie Merrimack Movement. The limits of this particular ice mass 

 would be naturally the east and west water-sheds, while the northern 



