222 GLACIAL GRAVELS OF MAINE. 



north ill the Audroscog'gin Valley at Rumford, and also in the Little Andros- 

 coggin Vallej^ at Bryants Pond. Practically it was a glacial river as far 

 south as the south end of Brya,nts Pond. 



South of this point the valley of the Little Androscoggin is bordered 

 by high hills. A plain of mixed sand, gravel, cobbles, and bowlderets, with 

 some bowlders, extends along the valley to West Paris. This plain is about 

 one-fourth of a mile wide, and the stones are all very much rounded, like 

 those of the osar-plain at Bryants Pond. It should be noted that we are 

 near the source of the Little Androscoggin, which stream is here only a 

 a good-sized brook. From Bryants Pond to West Paris the slope of the 

 stream averages about 35 feet per mile; from West Paris to South Paris it 

 is 8 or 10 feet; and it is only 4 or 5 feet from that point to the mouth of the 

 river at Auburn. Now, in the White Mountains, where the slopes are 100 

 or more feet per mile, the stones in the beds of the streams are much 

 rounded; but I have nowhere seen them so rounded as those in the valley 

 of the Little Androscoggin from Bryants Pond to West Paris. North of 

 the place where the osar-plain enters the valley of the Little Androscoggin 

 there is no such drift as the plain of very round stones that extends from 

 the foot of Bryants Pond to West Paris. Even in the highest late glacial 

 or postglacial floods the Little Androscoggin could not at this place be a 

 very large stream, for we are near its head waters. From whatever stand- 

 point, then, we look at the plain of very round gravel, cobbles, bowlderets, 

 and bowlders that extends from Bryants Pond to West Paris, we find neither 

 the size of the stream nor the steepness of slope necessary to account for 

 this plain as fluviatile sediments. Besides we know that a great glacial 

 river flowed into the north end of this valley. The steep hills would pre- 

 vent it from getting out of the valle}'. It must have flowed down the valley 

 doing its characteristic work. The result was this plain, which is thus 

 proved to be chiefly glacial as far as West Paris. 



At West Paris the valley of the Little Androscoggin abruptly broadens 

 into a triangular plain 3 or more miles in breadth. One apex of the 

 triangle is at West Paris, another at Trap Corner, Paris, and the third at 

 Snows Falls, where the valley narrows to 300 feet. The west side of this 

 triangular valley is bordered by a plain of sand, gravel, and well-rounded 

 cobbles which extends in nearly a straiglit line from West Paris to Snows 

 Falls. It presents the external appearances of an osar-plain. East of this 



