HARTLAND MONTVILLE SYSTEM. 



153 



as to s^^gg■est that it has been eroded, then passes Halldale aud soon crosses 

 the valley of the south branch of Half Moon Stream. Here it expands 

 into a plexus of reticulated ridges near one-fourth mile wide and 1 mile 

 long. Thus, at their junction these two glacial rivers must have behaved 

 very differently. The long Hartland glacial river swept everything 

 before it and eroded a deep channel in the till, while the shorter Free- 

 dom River deposited a very large amount of sediment. For some reason 

 the waters of this river wgre slowed down as they came to the level 

 ground north of the junction of the two glacial rivers, though they must 



„-4if. 





i^z^-=3,:s;«i?^_ — —"- 



^-:>^^^"::^i 



Fig. 19. — Keticulated ridges and Hogback Mountain, from the north. 



have been swift to the north of this place in order to have swept down 

 so much gravel, much of it containing cobbles and bowlderets. South of 

 their junction I have not been able to distinguish the gravels of the two 

 streams. 



A series of broad and somewhat reticulated ridges, inclosing kettle- 

 holes and large basins containing peat swamps, extends southward through 

 the Hogback Mountain Pass. I'he roadbed occasionally sinks into the 

 peat of one of these swamps. The pass is somewhat more than a mile 

 long and less than a fourth as broad. At the south end of the pass a 

 short hillside esker comes down the slopes of the hill lying on the east 

 side of the pass and joins the main system in the valley. The gravels 



