214 aLACIAL GEAVELS OF MAINE, 



eskers not at all plain-like. Near tlie Little Androscoggin River there is 

 apparently a long interval of 2 miles where there is no gravel. About 2 

 miles east of Mechanic Falls is a sand-and-gravel plain in Poland, which 

 extends for more than 2 miles southeastward near the line of the Grrand 

 Trunk Railway. The plain becomes finer on the east and south edges, and 

 passes by degrees into sand and at last into the clay which covers the 

 valley of the Little Androscoggin from Auburn many miles west. These 

 plains in Poland are a delta, but it is vxncertain whether they were formed 

 in a glacial lake or in the broad body of sea water which subsequently 

 covered Little Androscoggin Valley. 



Subsequent to the melting of the ice there was an overflow from the 

 valley of the Little Andi'oscoggin southeastward along a low pass, past 

 Danville Junction. There are several mounds of true glacial gravel in the 

 valley of Royal River in New Grloucester. These are properly situated 

 to be branches of either the Canton-Auburn or the West Sumner-Poland 

 system, but I have been able to trace no connection between them, although 

 the Danville Junction Pass is a favorable route for a glacial overflow. It 

 thus appears that both the long systems named end in deltas near the Little 

 Androscoggin River, and are therefore a feature of the later histor}^ of the 

 Ice age, when the ice had receded so far north that this valley was covered 

 by an arm of the sea or by an estuary. 



The length of the system from West Sumner to Mechanic Falls is 

 12 miles. 



BRANCHES IN HEBRON AND NEAR WEST MINOT. 



In the northeast part of Hebron is a short series of hillside kames 

 situated in the valley of a small brook named Bicknells River. They 

 expand toward the bottom of the hill into small terrace-like plains. One 

 of these plains is one-eighth of a mile in diameter. It consists of three 

 rather level terraces, each rising 6 to 10 feet above the next below it. The 

 gravel is but little waterworn. The general course of the series is south- 

 east, and the terminal plains are only about a mile from the main system 

 at East Hebron. It is uncertain whether this is a local series or whether it 

 was deposited by a tributary of the main glacial river. 



About three-eighths of a mile north of West Minot is a series of kames 

 which begins" on the side of a hill and extends down the hill for a short 

 fourth of a mile to join the main system in the valley. 



