THE HADLEY LAKE. 



629 



gorge. The high hill of sandstone which rises west of the \'illage is con- 

 nected south with Mount Toby by a sandstone ridge at about the height of 

 the high teiTace, and it is thei'efore certain that the old bed of the Con- 

 necticut can not have gone, as an inspection of the map would suggest, due 

 southwest to join the present bed at the Sunderland line. The Montague 

 depression may have been eroded l^y the i)re-CTlacial (/onnecticut hi a gi-eat 

 bend directed southward. It was more ])robably cut out of the soft sand- 

 stone bv the ice dividing- on Momit Toby. 



Farther south, around the west side of Mount Toln', in the narrows 

 which separate the Montague from the Hadley Lake, as well as along tlie 

 west side of the river from the entrance of the gorge below Northfield 



FiQ. 35.— Section thronsh the eroded front of the great delta at Montajarue. 



Farms to Sugar Loaf Mountain, the Triassic rocks everywhere approach 

 closelv to the })resent river and the high teiTace sands are preserved for the 

 most part only in sheltered recesses. 



THE HADLEY LAKE. 



THE NOKTH END OF THE LAKE IN GREENFIELD AND THE CHANNTIL OF 

 CONNECTION WITH THE MAIN VALLEY. 



In the last chapter I have traced the waters from the main valley 

 through the Bernardston Pass into the north of Grreenfield, where, at the 

 flood time, they widened somewhat into a small temporary lake, whose 

 outlines, as it extended west across the town, are indicated on the map by 

 the extent of the colors marked 1 s h and If, where they are di*ained by the 

 three branches of Mill Brook. 



After the waters had ceased to flow across from the main valley an 

 abundant supply still came down the valley of Fall River and pushed out 

 into this Greenfield Lake a mai-ked delta, and the broad bottom of this 



